Effect of physical activity and sun exposure on vitamin D status of Saudi children and adolescents by Al-Othman Abdulaziz, Al-Musharaf Sara, Al-Daghri Nasser M, Krishnaswamy Soundararajan, Yusuf Deqa S, Alkharfy Khalid M, Al-Saleh Yousef, Al-Attas Omar S, Alokail Majed S, Moharram Osama, Sabico Shaun, Chrousos George P

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