The authors gratefully thank Professor Ashok Agarwal (Center for Reproductive Medicine, Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, OH, USA) and Professor Hassan N. Sallam (Department of Obstetrics and Gynaecology, University of Alexandria, Alexandria, Egypt) for their valuable comments on the manuscript.
Conflict of interest
Feridoon Abbasnejad, Samad EJ Golzari, Kamyar Ghabili, Saeid Aslanabadi, Reza Rikhtegar, and Younes Ranjbar declare that they have no conflicts of interest.