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About Sickkids
About SickKids

Jonathon Maguire, MD, MSc, FRCPC

The Hospital for Sick Children
Paediatric Medicine

Research Institute
Project Investigator
Research Institute

University of Toronto
Assistant Professor

Phone: 416-813-7654
Fax: 416-813-5663
Email: jonathon.maguire@utoronto.ca
Alternate Phone: 416-813-6359

Brief Biography

Dr. Jonathon Maguire is an associate staff physician in the Division of Paediatric Medicine at The Hospital for Sick Children (SickKids), a scientist in the Applied Health Research Centre of the Li Ka Shing Knowledge Institute of St. Michael’s Hospital as well as a staff paediatrician in the Department of Paediatrics at St. Michael’s Hospital. Dr. Maguire graduated from the University of Toronto medical school in 2003 and completed a paediatric residency at SickKids where he was Chief Resident from 2006 to 2007. He completed a masters degree in clinical epidemiology at the University of Toronto in 2009 and an academic fellowship at SickKids where he held a Canadian Institutes of Health Research fellowship and a Society for Pediatric Research clinical research award.

Research Interests

Dr. Maguire’s research interests include clinical trials involving nutrition and development in young children as well as the creation of tools to facilitate evidence informed child health promotion in primary care and inpatient settings. He is a co-investigator in the development of a large Canadian practice based primary care research network called TARGet Kids!


Maguire JL., Birken CS, Loeb MB, Mamdani M, Thorpe K, Hoch JS, Mazzulli T, Borkhoff CM, Macarthur C, Parkin PC. DO IT Trial: vitamin D Outcomes and Interventions in Toddlers – a TARGet Kids! Randomized controlled trial. BioMed Central Pediatrics 2014, 14:37

Maguire JL., Birken C.S., Thorpe KE, Sochett E, Parkin P.C.  Parathyroid Hormone as a Functional Indicator of Vitamin D Sufficiency in Early Childhood. JAMA Pediatr.2014 Apr 168(4): 383-5

Maguire JL., Kulik D., Laupacis A., Kuppermann N., Parkin P.C. Clinical prediction rules for children: A systematic review. Pediatrics. 2011, 128(3): e666 -e677.

Maguire JL., Lebovic G, Kandasamy S, Khovratovich M, Mamdani M, Birken CS, Parkin PC. on behalf of the TARGet Kids! Collaboration. The relationship between cow’s milk and stores of vitamin D and iron in early childhood. Pediatrics 2013, 131:e144-e151

Maguire JL., Salehi L, Birken C.S., Carsley S, Mamdani M, Thorpe K.E., Lebovic G, Khovratovic M, Parkin P.C. The Association Between Total Duration of Breastfeeding and Iron Deficiency: A TARGet Kids! cross-sectional study. Pediatrics 2013, 131;e1530-e1537

Maguire JL., Birken C.S., O'Connor D., Macarthur C., Thorpe K., Mamdani M., Parkin P.C. Prevalence and Predictors of Low Vitamin D in Urban Toddlers.  Pediatrics and Child Health. 2010, 16(2): e11-e15

Maguire JL., Birken C.S., Jacobson S., Peer M., Taylor C., Khambalia A., Mekky M., Thorpe K., Parkin P.C.  Office Based Intervention to Reduce Bottle Use in Toddlers: A TARGet Kids! Pragmatic Randomized Trial.  Pediatrics. 2010, 126(2): e343-e350

Maguire J.L., Parkin P.C. Children with clinically important head injuries after head trauma: Is clinical decision making an art or a science? The Lancet 2009, 374(9963).

Maguire J.L., Boutis K., Laupacis A., Parkin P.C. Should this head injured child receive a head CT?: A systematic review of clinical prediction rules. Pediatrics. 2009, 123(7)

Maguire J.L.
, deVeber G. Parkin P.C., The association between iron deficiency anemia and stroke in young children. Pediatrics. 2007, 120(5):1-5

Maguire J.L., Healey J., Garfield H., Parkin P.C. Does a Pediatric after-hours clinic use evidence based guidelines in the management of acute otitis media? Pediatrics & Child Health. 2003, 8(7):427-431.