Varela-Rodríguez, B. M.
Pena-Bello, L.
Juiz-Valiña, P.
Vidal-Bretal, B.
Cordido, F.
Sangiao-Alvarellos, S.
Article History
Received: 16 April 2016
Accepted: 22 June 2016
First Online: 19 July 2016
Competing interests
: The authors declare no competing financial interests.