Omand, Jessica, Teresa To, Deborah O'Connor, Patricia Parkin, Catherine Birken, Kevin Thorpe, and Jonathon Maguire. 2018. “25-Hydroxyvitamin D and Health Service Utilization for Asthma in Early Childhood”. International Journal of Population Data Science 3 (4). https://doi.org/10.23889/ijpds.v3i4.928.