McGrath, L J, Spangler, L, Curtis, J R, Ehrenstein, V, Sørensen, H T, Saul, B, Levintow, S N, Reams, D, Bradbury, B D & Brookhart, M A 2020, ' Using negative control outcomes to assess the comparability of treatment groups among women with osteoporosis in the United States ', Pharmacoepidemiology and Drug Safety, vol. 29, no. 8, pp. 854-863 . https://doi.org/10.1002/pds.5037
Menopause (New York, N.Y.), vol 23, iss 2 Scholes, Delia; LaCroix, Andrea Z; Hubbard, Rebecca A; Ichikawa, Laura E; Spangler, Leslie; Operskalski, Belinda H; et al.(2016). Oral contraceptive use and fracture risk around the menopausal transition. Menopause, 23(2), 166-174. doi: 10.1097/gme.0000000000000595. UC San Diego: Retrieved from: http://www.escholarship.org/uc/item/62d1293x