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Embryo implantation
The many factors which influence embryo implantation (EI) may be grouped into 3 general categories:
• Embryo quality (EQ)
• Endometrial receptivity (ER) • Transfer efficiency (TE)
EI = EQ x ER x TE
Paulson et al, AJOG 1990;163:2020
Pregnancy rates after embryo transfer depend on the provider at embryo transfer
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