Jennuvat, S., Khanom, S., Prachasitthisak, N. and Vithayasai, N. 2023. Prevalence of Vitamin D deficiency in Pediatric Inflammatory Bowel Disease: A Retrospective Study at Queen Sirikit National Institute of Child Health. Journal of The Department of Medical Services. 48, 3 (Sep. 2023), 67–74.