BACKGROUND	The aims of this study are to : ( 1 ) preliminarily evaluate the effect of an individualized 10-year osteoporotic fracture risk calculator and decision aid ( OSTEOPOROSIS CHOICE ) for postmenopausal women at risk for osteoporotic fractures ; and ( 2 ) assess the feasibility and validity ( i.e. , absence of contamination ) of patient-level randomization ( vs. cluster randomization ) in pilot trials of decision aid efficacy .\