Teeratananon, T., S. Tangjitgamol, Y. Duangduen, and N. Ativanichayapong. “Vitamin D Level of Individuals Having Medical Service in a Tertiary Hospital: Vitamin D Level of Individuals in the Hospital”. Vajira Medical Journal : Journal of Urban Medicine, vol. 69, no. 1, Sept. 2024, p. e269874, doi:10.62691/vmj.2024.269874.