Funding for this research was provided by:
Swiss Government Excellence Scholarship (2015.0710)
Freiwillige Akademische Gesellschaft (FAG) of Basel (Not applicable)
Received: 20 May 2019
Accepted: 31 March 2020
First Online: 15 April 2020
Ethics approval and consent to participate
: All study participants were provided with an informed consent form (ICF) and gave their consent in written format prior to participation. The ICF and the research protocol were reviewed and approved in Switzerland by the Ethikkommission Nordwest- und Zentralschweiz (EKNZ 2016–00738) and in the Philippines by the National Ethics Committee (NEC 2016–013).
: Not applicable.
: The authors declare that no competing interests exist.