Letter to the editor: "Clinical significance of micronutrient supplements in patients with coronavirus disease 2019: A comprehensive systematic review and meta-Analysis"
1 University Medical Centre Groningen and University of Groningen, the Netherlands Fultsemaheerd 16, 9736CN Groningen, the Netherlands. Electronic address: r-graaff@home.nl.
2 University Medical Centre Groningen, the Netherlands; Department of Internal Medicine, Münchwilerstrasse 20, 4332, Stein, Switzerland. Electronic address: dr.eggersdorfer@gmail.com.