Not necessarily causal, however
Jan. 14, 1794: First Successful Cesarean in U.S.
Ectopic pregnancy - Wikipedia
Cesarean Section
Fertility outcomes of IVF/ICSI after Caesarean section: a cohort study - ScienceDirect
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Hospital-Based Medicine articles page [82]
Having a C-section linked to troubles conceiving again: study
The ultimate step-by-step guide to C-Sections