Agreement and validity of pharmacy data versus self-report for use of osteoporosis medications among chronic glucocorticoid users.
Curtis JR, Westfall AO, Allison J, Freeman A, Kovac SH, Saag KG. Agreement and validity of pharmacy data versus self-report for use of osteoporosis medications among chronic glucocorticoid users. Pharmacoepidemiol Drug Saf. 2006 Oct; 15(10):710-8.