Peer Reviewed Articles

Gray N, Howard A, Zhu J, Feldman LY, To T. Association Between Inhaled Corticosteroid Use and Bone Fracture in Children With Asthma. JAMA Pediatr. Published online November 13, 2017. doi:10.1001/jamapediatrics.2017.3579 [full article]

Kendzerska T, To TM, Aaron SD, Lougheed MD, Sadatsafavi M, FitzGerald JM, Gershon AS, Canadian Respiratory Research Network. The impact of a history of asthma on long-term outcomes of people with newly diagnosed chronic obstructive pulmonary disease: A population study. Journal of Allergy and Clinical Immunology. 2017 Mar 31;139(3):835-43. [abstract]

Conference Abstracts

Abdullah K, Zhu J, Feldman LY, Dell SD, Lougheed MD, Licskai C, Gershon AS, To T. Asthma Exacerbation In Women During Pregnancy And Its Association With Adverse Perinatal Outcomes In Mother And Baby. C26. ASTHMA IN INFANTS AND CHILDREN 2017 May (pp. A5089-A5089). American Thoracic Society. [abstract]

To T, Zhu J, Carlsten C, Larsen K, Ryckman K, Feldman LY, Crighton E, Lougheed MD, Licskai C, Villeneuve PJ, Su Y. Do Community Demographics, Environmental Characteristics And Access To Care Affect The Risk Of Developing COPD In People With Asthma? A48. COPD: ISSUES IN HEALTH CARE DELIVERY 2017 May (pp. A1715-A1715). American Thoracic Society. [abstract]

To T, Zhu J, Feldman LY, Villeneuve PJ, Licskai C, Gershon AS, Larsen K, Glockler-Lauf SD, Miller AB. The Impact Of Air Pollution On The Progression Of Asthma To COPD In Women: A Longitudinal Cohort Study. A49. ISSUES IN COPD 2017 May (pp. A1761-A1761). American Thoracic Society. [abstract]

Peer Reviewed Articles

Larsen K, Zhu J, Feldman LY, Simatovic J, Dell S, Gershon AS, To T. The Annual September Peak in Asthma Exacerbation Rates. Still a Reality? Annals of the American Thoracic Society. 2016 Feb;13(2):231-9. [pdf]

Feldman LY, Gao C, Zhu J, Simatovic J, Licskai C, To T. Estimating Toronto’s health services use for the 2015 Pan American and Parapan American Games. Perspectives in Public Health. 2016 Mar;136(2):93-8. Perspectives in Public Health. 2016 Mar 1;136(2):93-8. [abstract]

To T, Zhu J, Larsen K, Simatovic J, Feldman L, Ryckman K, Gershon A, Lougheed MD, Licskai C, Chen H, Villeneuve PJ. Progression from asthma to chronic obstructive pulmonary disease. Is air pollution a risk factor? American Journal of Respiratory and Critical Care Medicine. 2016 Aug 15;194(4):429-38. [pdf]

To T, Zhu J, Williams DP, Feldman L, Simatovic J, Gershon A, Lougheed MD, Licskai C, Dell S. Frequency of health service use in the year prior to asthma death. Journal of Asthma. 2016 May 27;53(5):505-9. [abstract]

Conference Abstracts

Radhakrishnan DK, Shariff S, Richard L, To T. Does Maternal Stress Influence The Development Of Asthma In Childhood? A63. PEDIATRIC ASTHMA: PREDICTORS AND OUTCOMES 2016 May (pp. A2158-A2158). American Thoracic Society. [abstract]

To T, Zhu J, Ryckman K, Feldman LY, Larsen K, Williams DP, Gershon AS. Mental Health Services Use And Adult Onset Asthma In Ontario, Canada. A106. EPIDEMIOLOGY AND RISK FACTORS OF ASTHMA: FROM THE CRIB TO ADULTHOOD 2016 May (pp. A2778-A2778). American Thoracic Society. [abstract]

To T, Zhu J, Feldman LY, Ryckman K, Larsen K, Gershon AS. Asthma Hospitalizations And ED Visits Before, During And After Pregnancy Among Women With Asthma. A106. EPIDEMIOLOGY AND RISK FACTORS OF ASTHMA: FROM THE CRIB TO ADULTHOOD 2016 May (pp. A2779-A2779). American Thoracic Society. [abstract]

Peer Reviewed Articles

Simatovic J, Zhu J, Gao C, Feldman L, Williams DP, Gershon A, Lougheed D, Licskai C, Dell S, To T. Characteristics of individuals admitted to the intensive care unit for asthma Journal of Pulmonary & Respiratory Medicine. 2015; 5: 256. [pdf]

To T, Guan J, Zhu J, Lougheed MD, Kaplan A, Tamari I, Stanbrook MB, Simatovic J, Feldman L, Gershon AS. Quality of asthma care under different primary care models in Canada: a population-based study. BMC Family Practice. 2015 Feb 14;16(1):19. [pdf]

To T, Zhu J, Villeneuve PJ, Simatovic J, Feldman L, Gao C, Williams D, Chen H, Weichenthal S, Wall C, Miller AB. Chronic disease prevalence in women and air pollution—a 30-year longitudinal cohort study. Environment International. 2015 Jul 31;80:26-32. [pdf]

To T, Feldman L, Simatovic J, Gershon AS, Dell S, Su J, Foty R, Licskai C. Health risk of air pollution on people living with major chronic diseases: a Canadian population-based study. BMJ Open. 2015 Sep 1;5(9):e009075. [pdf]

Conference Abstracts

To T, Zhu J, Larsen K, Williams D, Simatovic J, Gershon AS, Lougheed MD, Licskai C, Chen H, Villeneuve PJ, Crighton E. Progression From Asthma To Asthma And COPD Overlap Syndrome (ACOS): Is Air Pollution A Risk Factor? C104. INDOOR AND OUTDOOR POLLUTION: EPIDEMIOLOGY AND MECHANISMS 2015 May (pp. A5239-A5239). American Thoracic Society. [abstract]

Larsen K, Zhu J, Feldman L, Simatovic J, Dell SD, Gershon AS, To T. Is the asthma September peak still a reality? D107. NOVEL ASTHMA EPIDEMIOLOGY AND MECHANISMS 2015 May (pp. A6278-A6278). American Thoracic Society. [abstract]

Kendzerska T, Sadatsafavi M, Aaron SD, To T, Lougheed MD, FitzGerald JM, Gershon AS. Trends In Asthma-Chronic Obstructive Pulmonary Disease Overlap Syndrome Prevalence, Incidence And Mortality In Ontario, Canada: A Population Study. D103. COPD: FOCUS ON RESEARCH AND PATIENT CARE 2015 May (pp. A6165-A6165). American Thoracic Society. [abstract]

Kendzerska T, To T, Aaron SD, Lougheed MD, Sadatsafavi M, FitzGerald JM, Gershon AS. Long-Term Adverse Health Consequences Associated With A History Of Asthma In Patients With Chronic Obstructive Pulmonary Disease: An Observational Population Cohort Study. D103. COPD: FOCUS ON RESEARCH AND PATIENT CARE 2015 May (pp. A6166-A6166). American Thoracic Society. [abstract]

To T, Zhu J, Villeneuve PJ, Simatovic J, Feldman L, Williams D, Chen H, Weichenthal S, Wall C, Miller AB. Fine Particulate Matter Air Pollution And Chronic Cardiopulmonary Disease Risk In Women-A 30-Year Longitudinal Cohort Study. C104. INDOOR AND OUTDOOR POLLUTION: EPIDEMIOLOGY AND MECHANISMS 2015 May (pp. A5238-A5238). American Thoracic Society. [abstract]

Peer Reviewed Articles

Radhakrishnan DK, Dell SD, Guttmann A, Shariff SZ, Liu K, To T. Trends in the age of diagnosis of childhood asthma. Journal of Allergy and Clinical Immunology. 2014 Nov 30;134(5):1057-62. [abstract]

Conference Abstracts

Feldman L, Zhu J, Simatovic J, To T. Estimating the impact of temperature and air pollution on cardiopulmonary and diabetic health during the TORONTO 2015 Pan Am/Parapan Am Games. Allergy, Asthma & Clinical Immunology 2014 Mar 1 (Vol. 10, No. S1, p. A62). BioMed Central. [abstract]

To TM, Zhu J, Simatovic J, Feldman L, Gershon AS, Lougheed D, Licskai C, Dell SD. Frequent Health Services Use In The Year Prior To Death-A Marker For Asthma Mortality? A104. ASTHMA EPIDEMIOLOGY 2014 May (pp. A2291-A2291). American Thoracic Society. [abstract]

Simons E, Dell S, Moineddin R, To T. Deprivation Is Longitudinally Associated With Incident Childhood Asthma. Journal of Allergy and Clinical Immunology. 2014 Feb 1;133(2):AB42. [abstract]

10 Year Anniversary Report

Screen Shot 2014-12-03 at 1.03.29 PM2003-2013 Ontario Asthma Surveillance Information System (OASIS): 10th Anniversary Report [pdf]

Peer Reviewed Articles

To T, Shen S, Atenafu EG, Guan J, McLimont S, Stocks B, Licskai C. The air quality health index and asthma morbidity: a population-based study. Environmental Health Perspectives. 2013 Jan;121(1):46. [pdf]

To T, Stanojevic S, Feldman R, Moineddin R, Atenafu EG, Guan J, Gershon AS. Is asthma a vanishing disease? A study to forecast the burden of asthma in 2022. BMC Public Health. 2013 Mar 21;13(1):254. [pdf]

Conference Abstracts

Akseer N, Gershon AS, Stanojevic S, Zhu J, Dell S, Simatovic J, Feldman L, To T. Have Emergency Department Wait Times To See A Physician For Asthma Decreased Over Time? A Population-Based Study Of Trends From 2003-2010. C102. NEW ASPECTS OF THE DIAGNOSIS AND TREATMENT OF OBSTRUCTIVE LUNG DISEASES 2013 May (pp. A5024-A5024). American Thoracic Society. [abstract]

To T, Feldman L, Foty R, Dell S, Gershon AS, Zhu J, Su J, Simatovic J, Licskai C. Using The Air Quality Health Index To Measure The Impact Of Poor Air Quality On Chronic Diseases In Ontario: A Population-Based Study. C105. POLLUTION EFFECTS 2013 May (pp. A5082-A5082). American Thoracic Society. [abstract]

To T, Kozyriskyj A, Prosser RJ, Gershon AS, Camp PG, Doucet M, Garvey NJ, Reimer K, Gilbert C, McRae L. Burden Of Comorbidity On Asthma Mortality: A National Population-Based Study From Canada. A47. ASTHMA: OCCUPATIONAL AND ENVIRONMENTAL FACTORS 2013 May (pp. A1628-A1628). American Thoracic Society. [abstract]

Peer Reviewed Articles

Gershon A, Guan J, Victor JC, Wang C, To T. The course of asthma activity: a population study. Journal of Allergy and Clinical Immunology. 2012 Mar 31;129(3):679-86. [abstract]

Gershon AS, Victor JC, Guan J, Aaron SD, To T. Pulmonary function testing in the diagnosis of asthma: a population study. CHEST Journal. 2012 May 1;141(5):1190-6. [abstract]

Gershon AS, Guan J, Wang C, Victor JC, To T. Describing and quantifying asthma comorbidty: a population study. PLoS One. 2012 May 7;7(5):e34967. [pdf]

Crighton EJ, Feng J, Gershon A, Guan J, To T. A spatial analysis of asthma prevalence in Ontario. Canadian Journal of Public Health. 2012 Jul 19;103(5):384-9.[pdf]

Conference Abstracts

Radhakrishnan DK, Lu H, Dell S, Guttmann A, To T. Has The Severity Of Asthma At Its Onset Changed Over Time For Children? B61. PEDIATRIC ASTHMA 2012 May (pp. A3348-A3348). American Thoracic Society. [abstract]

To T, Stanojevic S, Dell S, Lougheed D, Zheng H, McLimont S, Gershon AS. The Prevalence Of Severe Asthma In Ontario, Canada From 2001 To 2009. C106. DETERMINANTS OF CONTROL AND SEVERITY OF ASTHMA AND COPD 2012 May (pp. A5228-A5228). American Thoracic Society. [abstract]

Peer Reviewed Articles

To T, Tarlo SM, McLimont S, Haines T, Holness DL, Lougheed MD, Liss GM, Cicutto L. Feasibility of a provincial voluntary reporting system for work-related asthma in Ontario. Canadian Respiratory Journal. 2011;18(5):275-7. [pdf]

Conference Abstracts

To T, Atenafu E, Guan J, McLimont S, Stocks B, Licskai C. Quantifying The Hazard Of Air Quality On Asthma Health. C104. AIR POLLUTION EPIDEMIOLOGY 2011 May (pp. A5420-A5420). American Thoracic Society. [abstract]

To T, Guan J, McLimont S, Gershon AS. Does The Quality Of Asthma Care Vary Among Family Practices? B38. CAN WE IMPROVE QUALITY AND REDUCE COST OF CARE? 2011 May (pp. A2922-A2922). American Thoracic Society. [abstract]

To T, Moineddin R, Atenafu E, Guan J, McLimont S, Gershon AS. Forecasting Asthma Prevalence And Health Care Use To 2020, Ontario, Canada. B38. CAN WE IMPROVE QUALITY AND REDUCE COST OF CARE? 2011 May (pp. A2933-A2933). American Thoracic Society. [abstract]

Peer Reviewed Articles

To T, Wang C, Guan J, McLimont S, Gershon AS. What is the lifetime risk of physician-diagnosed asthma in Ontario, Canada? American Journal of Respiratory and Critical Care Medicine. 2010 Feb 15;181(4):337-43. [pdf]

Gershon AS, Wang C, Guan J, To T. Burden of comorbidity in individuals with asthma. Thorax. 2010 Jul 1;65(7):612-8. [pdf]

Gershon AS, Guan J, Wang C, To T. Trends in asthma prevalence and incidence in Ontario, Canada, 1996–2005: a population study. American Journal of Epidemiology. 2010 Aug 17;172(6):728-36. [pdf]

To T, Guttmann A, Lougheed MD, Gershon AS, Dell SD, Stanbrook MB, Wang C, McLimont S, Vasilevska-Ristovska J, Crighton EJ, Fisman DN. Evidence-based performance indicators of primary care for asthma: a modified RAND Appropriateness Method. International Journal for Quality in Health Care. 2010 Dec 1;22(6):476-85. [pdf]

Conference Abstracts

Gershon AS, Guan J, Wang C, Raut R, To T. Incidence and duration of asthma remissions: A population based study. B47. ASTHMA EPIDEMIOLOGY: CLINICAL AND PHARMACOLOGICAL DETERMINANTS OF ASTHMA OUTCOMES 2010 May (pp. A3132-A3132). American Thoracic Society. [abstract]

To T, Guttmann A, Lougheed MD, Gershon A, Dell S, Wang C, McLimont S, Raut R, Stanbrook M. Developing Asthma Primary Care Performance Indicators. A39. IMPROVING THE QUALITY AND DELIVERY OF LUNG HEALTH CARE 2010 May (pp. A1454-A1454). American Thoracic Society.  [abstract]

Peer Reviewed Articles 

Gershon AS, Wang C, Guan J, Vasilevska-Ristovska J, Cicutto L, To T. Identifying patients with physician-diagnosed asthma in health administrative databases. Canadian Respiratory Journal. 2009;16(6):183-8. [pdf]

Peer Reviewed Articles

To T, Cicutto L, Degani N, McLimont S, Beyene J. Can a community evidence-based asthma care program improve clinical outcomes?: a longitudinal study. Medical Care. 2008 Dec 1;46(12):1257-66. [full text]

To T, Dell S, Dick P,  Cicutto L. The burden of illness experienced by young children associated with asthma: a population-based cohort study. Journal of Asthma. 2008 Jan 1;45(1):45-9. [abstract]

To T, Wang C, Dell S, Fleming-Carroll B, Parkin P, Scolnik D, Ungar W, PAMG Team. Risk factors for repeat adverse asthma events in children after visiting an emergency department. Ambulatory Pediatrics. 2008 Oct 31;8(5):281-7. [abstract]

Peer Reviewed Articles

Gershon A, Wang C, Cicutto L, To T: ICES Report: The Burden of Asthma: Can it be eased? Healthcare Quarterly 2007: 10(1): pp 22-24 [pdf]

To T, Gershon A, Wang C, Dell S, Cicutto L. Persistence and remission in childhood asthma: a population-based asthma birth cohort study. Archives of pediatrics & adolescent medicine. 2007 Dec 1;161(12):1197-204. [abstract]

Peer Reviewed Articles

To T, Dell S, Dick PT, Cicutto L, Harris JK, MacLusky IB, Tassoudji M. Case verification of children with asthma in Ontario. Pediatric allergy and immunology. 2006 Feb 1;17(1):69-76. [pdf]

Investigative Reports

Screen Shot 2014-12-03 at 2.16.57 PMTo T, Gershon A, Cicutto L, Wang CN. The burden of asthma: can it be eased? The Ontario record. Healthcare quarterly (Toronto, Ont.). 2006 Dec;10(1):22-4. [pdf]

Investigative Reports

Screen Shot 2014-12-03 at 2.14.20 PMTo T, Dell S, Dick P, Cicutto L, Harris J, Tassoudji M. Burden of Childhood Asthma: ICES Investigative Report. Toronto: Institute for Clinical Evaluative Sciences. Toronto, Ontario. 2004. [pdf]