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Agreement between oral contraceptive users and prescribers: implications for case-control studies

Leeuwen, F.E. (Flora) van, Duijn, C.M. (Cornelia) van, Camps, M.H., Kempers, B.A., Mentjens, M.F., Mulder, H.B., Schouten, E.G. (Evert), Zwijsen, R.M.L., Rookus, M.A. (Matti)
1992