Correction to: A prospective randomized trial comparing corifollitropin-α late-start (day 4) versus standard administration (day 2) in expected poor, normal, and high responders undergoing controlled ovarian stimulation for IVF (Journal of Assisted Reproduction and Genetics, (2020), 37, 5, (1163-1170), 10.1007/s10815-020-01742-5)