Expression of concern: "The addition of growth hormone adjuvant therapy to the long down regulation protocol in poor responders undergoing in vitro fertilization: Randomized control trial" [Eur. J. Obstet. Gynecol. Reprod. Biol. 228 (2018) 161-165, ISSN 0301-2115, https://doi.org/10.1016/j.ejogrb.2018.06.035]