AUTHOR=Rehman Rehana , Alam Faiza , Baig Mukhtiar , Khan Aysha Habib , Ahmed Naseer TITLE=Editorial: Vitamin D Deficiency and Sufficiency in Reproduction and Bone Metabolism JOURNAL=Frontiers in Endocrinology VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2021.740021 DOI=10.3389/fendo.2021.740021 ISSN=1664-2392