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2. Ectopic pregnancy;Cole, S.; Clarke, J.A.;BMJ,1988
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4. A study of the incidence, the trend and the management of patients with ectopic pregnancies in the Scottish highlands;Kok, K.P.; Miahmood, T.A.; Lees, D.A.R.;Health Bull (Edinb),1976
5. Causes of the increase in the incidence of ectopic pregnancy;Makinen, J.I.; Erkkola, R.U.; Laippala, P.J.;A4mJ Obsiet Gynecol,1989