Expression of Concern: Metformin in the treatment of clomiphene citrate-resistant women with polycystic ovary syndrome undergoing in vitro fertilisation treatment: A randomised controlled trial
Abstract
We, the Editor and Publisher of Journal of Obstetrics and Gynaecology, are issuing an Expression of Concern for the following article:Qublan, H. S., Al-Khaderei, S., Abu-Salem, A. N., Al-Zpoon, A.,...
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Evidence Hub reads this as a randomized trial, done in people. Its evidence level is 2 of 5 (High · randomized trial). Randomized trials of a reasonable size are the strongest single-study design.
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