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Bender, Nicole; Herrmann, Björn; Andersen, Berit; Hocking, Jane S; van Bergen, Jan; Morgan, Jane; van den Broek, Ingrid V F; Zwahlen, Marcel; Low, Nicola (2011). Chlamydia infection, pelvic inflammatory disease, ectopic pregnancy and infertility: cross-national study. Sexually transmitted infections, 87(7), pp. 601-608. London: BMJ Publishing Group 10.1136/sextrans-2011-050205
