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Pregnancy outcomes in infertility trials Vail & Gardner, Hum. Reprod. 2003
Bias
Selection bias Performance bias
Attrition bias Detection bias
Target Population Random Allocation
Intervention
group
Exposed to intervention
Follow up Outcomes
Control group
No intervention
Follow up Outcomes
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PRECONGRESS COURSE 14 I VIENNA, AUSTRIA – 23 JUNE 2019 21
