1. School of Nursing at the Instituto Médico Basurto at the University of the Basque Country, Bilbao, Bizkaia, Spain
2. Instituto Médico Basurto at the University of the Basque Country, Bilbao, Bizkaia, Spain, Basque Institute of Physical Education at the University of the Basque Country, Vitoria-Gasteiz, Araba, Spain
3. Instituto Médico Basurto, University of the Basque Country, Bilbao, Bizkaia, Spain
4. Instituto Médico Basurto at the University of the Basque Country, Bilbao, Bizkaia, Spain
5. Instituto Médico Basurto, University of the Basque Country, Bilbao, Bizkaia, Spain,