Cecchino, Gustavo N. http://orcid.org/0000-0003-1226-3353
Canillas, Guillermo M.
Cruz, María
García-Velasco, Juan A.
Article History
Received: 12 March 2019
Accepted: 10 September 2019
First Online: 18 October 2019
Compliance with ethical standards
: The Ethics Committee of the University Hospital Puerta de Hierro Majadahonda approved the study protocol (Identification Code 1802-MAD-014-JG; February 26, 2018), which also complied with the Spanish law on assisted reproductive technologies. The need for informed consent was waived owing to the retrospective design of this study, as stated in the Institutional Review Board approval letter.
: The authors declare that they have no conflict of interest.