RT Journal Article SR Electronic T1 Low bone density is not always bisphosphonate deficiency JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 683 OP 683 DO 10.3949/ccjm/76a.12001 VO 76 IS 12 A1 Brian F. Mandell YR 2009 UL http://www.ccjm.org/content/76/12/683.abstract AB