RT Journal Article SR Electronic T1 Calcium and vitamin D: To supplement or not? JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 693 OP 698 DO 10.3949/ccjm.85a.18026 VO 85 IS 9 A1 Ian R. Reid YR 2018 UL http://www.ccjm.org/content/85/9/693.abstract AB