Israsena Na Ayudhya, W. and Rojanawong, W. 2022. Prevalence and Risk Factors of Positional Obstructive Sleep Apnea (POSA) among Children with Obstructive Sleep Apnea. Vajira Medical Journal : Journal of Urban Medicine. 66, 6 (Dec. 2022), 381–388. DOI:https://doi.org/10.14456/vmj.2022.39.