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Letter
16 June 2020
Vitamin D Supplementation to Prevent COVID-19 in Patients with COPD: A Research Perspective
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1
Department of Pulmonology, Hedi Chaker Hospital, Sfax, Tunisia
2
Department of Family Medicine, Faculty of Medicine, University of Sfax, Sfax, Tunisia
3
Department of Biochemistry, Habib Bourguiba Hospital, Sfax, Tunisia
*
Author to whom correspondence should be addressed.