First Clinical College Hainan Medical University Haikou Hainan 570100 China;
First Clinical College Hainan Medical University Haikou Hainan 570100 China;
School of International Education Hainan Medical University Haikou Hainan 570100 China;
School of Tropical Medicine and Laboratory Medicine Hainan Medical University Haikou Hainan 570100 China;
School of Public Health Hainan Medical University Haikou Hainan 570100 China;
Clinical Skills Center Hainan Medical University Haikou Hainan 570100 China;
Vitamin D; Immune regulation; Autoimmune diseases;