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    Contraceptive method change among rural Sri Lankan women.Amy Ong Tsui, Shyam Thapa, David Hamill & Victor de Silva - 1989 - Journal of Biosocial Science 21 (S11):133-148.
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  2. (1 other version)Dynamics of contraceptive use.Amy Ong Tsui & M. A. Herbertson - forthcoming - Journal of Biosocial Science. Supplement.