Funding for this research was provided by:
Fondecyt, Ministerio de Educación, Gobierno de Chile (11110148)
Received: 15 March 2019
Accepted: 14 October 2019
First Online: 4 November 2019
Ethics approval and consent to participate
: This study did not require official or institutional ethical approval.
: Not applicable.
: The authors declare that they have no competing interests. Melatonin was purchased from Selleckchem (Houston, TX, USA) and this company was not involved in this work.