Re: Vitamin D and gestational diabetes mellitus: a systematic review based on data free of Hawthorne effect. (5th June 2018) - Corcoy, Rosa; Mendoza, Lilian C; Simmons, David; Desoye, Gernot; Mathiesen, Elisabeth R; Kautzky‐Willer, Alexandra; Damm, Peter; Dunne, Fidelma P; Wender‐Ozegowska, Ewa; Lapolla, Annunziata; van Assche, Andre; Devlieger, Roland; et al.