Problem
Impact of vitamin D on the course of COVID-19 during pregnancy: A case control study Selcan Sinaci a, *, Doga Fatma Ocal a , Didem Fatma Yucel Yetiskin a , Derya Uyan Hendem a , Gul Nihal Buyuk a , Sule Goncu Ayhan a , Atakan Tanacan a , A. Seval Ozgu-Erdinc a , Ozlem Moraloglu Tekin a,b , Dilek Sahin a,b
a) What methods were used to control confounding bias during data analysis? Were these methods sufficient?
b) What measures of association were reported in this study?
c) What were the major results of this study?
d) Did the discussion section adequately address the limitations of the study?
e) What were the authors' main conclusions? Were they justified by the findings?