Funding for this research was provided by:
Asociación Española de Economía de la Salud (XXII Beca de Investigación en Economía y Salud)
Article History
Received: 19 September 2016
Accepted: 25 May 2020
First Online: 24 July 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.