RT Journal Article SR Electronic T1 The complexities of vitamin D JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 288 OP 288 DO 10.3949/ccjm/77a/05001 VO 77 IS 5 A1 Mandell, Brian F. YR 2010 UL http://www.ccjm.org/content/77/5/288.abstract AB