Limitations in the Study of Vitamin D Supplementation and Severe Asthma Exacerbations

Affiliations

• ¹ Chung Shan Medical University, School of Medicine, Taichung, Taiwan.
• ² Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Third Hospital of Shanxi Medical University, Tongji Shanxi Hospital, Taiyuan, 030032, China.
• ³ Chung Shan Medical University Hospital, Department of Allergy, Immunology & Rheumatology, Taichung, Taiwan.
• ⁴ China Medical University, Graduate Institute of Integrated Medicine, Taichung, Taiwan.
• ⁵ Chung Shan Medical University, Institute of Medicine/Department of Nursing, Taichung, Taiwan; [email protected].