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. 2011 Nov 9;2011(11):CD002855. doi: 10.1002/14651858.CD002855.pub4

Wiebe 1999.

Methods computer generated list of random numbers, sealed, opaque envelopes
Participants 398 women, ≤ 7 weeks pregnant confirmed by ultrasound, University Hospital Vancouver, Canada 
 exclusion criteria: abnormal haematologic parameters
Interventions Phase 1: 
 group 1: 
 Tamoxifen 40mg/po and 800mcg misoprostol/pv > 48 hours 
 group 2: Methotrexate 50mg/m2 and misoprostol 800mcg/pv >96 hours 
 Phase 2: 
 group 1: 
 Tamoxifen 40 mg/day for 4 days (= total dose of 160mg) and misoprostol 800mcg/pv > 48 hours 
 group 2: Methotrexate 50 mg/m2 and misoprostol 800mcg/pv >96 hours
Outcomes failure rate, side effects, women's preference
Notes no major complications were reported
Risk of bias
Bias Authors' judgement Support for judgement
Allocation concealment (selection bias) Low risk A ‐ Adequate