[1] Univ Cantabria, Dept Nursing, Ave Valdecilla S-N, Santander 39008, Spain
[2] IDIVAL Inst Invest Sanitaria Valdecilla, Calle Cardenal Herrera Oria S-N, Santander 39011, Spain
[3] Univ Seville, Fac Nursing Physiotherapy & Podiatry, Dept Nursing, C Avenzoar 6, Seville 41009, Spain
[4] Cantabrian Hlth Serv, Av Herrera Oria S-N, Santander 39011, Spain