[1] Inst Biomed Res Salamanca IBSAL, Primary Care Prevent & Hlth Promot Res Network RE, Primary Hlth Care Res Unit, Alamedilla Hlth Ctr,Hlth Serv Castilla & Leon SAC, Salamanca 37003, Spain
[2] Univ Salamanca, Dept Biomed & Diagnost Sci, E-37008 Salamanca, Spain
[3] Inst IDIAP Jordi Gol, Primary Hlth Care Res Unit Barcelona, Barcelona 08007, Spain
[4] Univ Castilla La Mancha, Hlth & Social Res Ctr, Cuenca 16071, Spain
[5] Basque Hlth Serv Osakidetza, Primary Hlth Care Res Unit Bizkaia, Bilbao 48014, Spain
[6] Inst Invest Sanitaria IIS Aragon, Torre Ramona Hlth Ctr, Aragon Hlth Serv, Zaragoza 50013, Spain
[7] Castilla & Leon Hlth Serv, Casa Barco Hlth Ctr, Valladolid 47007, Spain
[8] Univ Salamanca, Dept Med, E-37008 Salamanca, Spain
[9] Univ Salamanca, Dept Nursing & Physiotherapy, E-37008 Salamanca, Spain
[10] Hlth Serv Castilla & Leon, Alamedilla Hlth Ctr, Salamanca, Spain
[11] Catalan Hlth Serv, Passeig de St Joan Hlth Ctr, Barcelona, Spain
[12] Catalan Hlth Serv, Ca NOriac Hlth Ctr, Barcelona, Spain
[13] Catalan Hlth Serv, St Roc Hlth Ctr, Barcelona, Spain
[14] Hlth Serv Castilla La Mancha, Rio Tajo Hlth Ctr, Barcelona, Spain
[15] Hlth Serv Castilla & Leon, Casa Barco Hlth Ctr, Salamanca, Spain
[16] Hlth Serv Castilla & Leon, San Pablo Hlth Ctr, Salamanca, Spain
[17] Hlth Serv Aragon, Torre Ramona Hlth Ctr, Zaragoza, Spain
[18] Basque Hlth Serv Osakidetza, Primary Care Res Unit Bizkaia, Bilbao, Spain