Received: 24 July 2019
Accepted: 27 December 2019
First Online: 14 January 2020
Compliance with ethical standards
: The study was approved by the Ethics Committee on Animal and Human Experimentation of the Autonomous University of Barcelona (UAB- CEEAH Barcelona, Spain) and was conducted in accordance with the Declaration of Helsinki. Participants signed an online informed consent and were not financially compensated for their participation.
: The authors declare that they have no conflict of interest.