Association of vitamin D deficiency and insufficiency with uncontrolled type 1 diabetes Mellitus among Saudi pediatric patients; a hospital-based retrospective study - Almansour, Salman; Alsalamah, Abdullrahman; Almutlaq, Mohammad; Sheikh, Ahmed; Hamdan, Hamdan Z.; Al-Nafeesah, Abdullah; AlEed, Ashwaq; Adam, Ishag; Al-Wutayd, Osama (Frontiers in Pediatrics, 2025)