Bone mineral density determinations by dual-energy x-ray absorptiometry in the management of patients with Marfan syndrome--some factors which affect the measurement. - Giampietro PF; Peterson MG; Schneider R; Davis JG; Burke SW; Boachie-Adjei O; Mueller CM; Raggio CL (HSS journal : the musculoskeletal journal of Hospital for Special Surgery, 2007)