[1] Univ Autonoma Madrid, Dept Nursing, Madrid, Spain
[2] Univ Autonoma Madrid, Dept Sociol, Madrid, Spain
[3] UAM, Grp Invest Cualitat Salud GIQS, Madrid, Spain
[4] Inst Invest Sanitaria Puerta de Hierro IISPH, Madrid, Spain
[5] Univ Leeds, Sch Hlth Care, Nursing, Leeds, W Yorkshire, England
[6] Reg Govt Madrid, Dept Prevent Promot & Educ Hlth, Madrid, Spain
[7] Inst Invest Sanitaria Gregorio Maranon IISGM, Madrid, Spain
[8] Hosp La Princesa, Madrid, Spain
[9] Hosp Clin Barcelona, Barcelona, Spain