1.
Schuetz P, Gregoriano C, Keller U. Supplementation of the population during the COVID-19 pandemic with vitamins and micronutrients – how much evidence is needed?. Swiss Med Wkly [Internet]. 2021 May 19 [cited 2024 Nov. 19];151(1920):w20522. Available from: https://smw.ch/index.php/smw/article/view/3004