0465-546X 0465-546X S0465-546X2017000200167 Spain Spain Spain Spain 00 06 2017 00 06 2017 63 247 167 205

1 European Foundation for the improvement of living and Working Conditions (Eurofund) 2 1999 3 2011 31 502-15 4 2010 11 5 Scottish Intercollegiate Guidelines Network 6 Scottish Intercollegiate Guidelines Network 7 Editorial Board of the Cochrane Collaboration Back Review Group 2003 28 1290-9 8 2012 69 610-8 9 2005 50 253-62 10 2012 32 375-82 11 2012 41 3568-74 12 2011 62 1-8 13 2014 4 258-63 14 2013 7 331-5 15 2009 34 326-8 16 2012 18 321-7 17 2014 4 179-85 18 2012 63 215-8 19 2011 39 67-78 20 2016 89 7-22 21 2014 47 291-301 22 2008 29 487-92 23 2007 143 409-15 24 2016 6 25 2015 57 253-8 26 2008 15 1982-8 27 2014 157 294-300 28 2014 88 203-15 29 2007 5 308-15 30 2008 22 91-5 31 2013 90 482-7 32 2011 82 434-40 33 2009 16 947-50 34 2010 7 698-704 35 2012 32 142-8 36 1998 77 1-13 37 2009 32 S70-86 38 2012 42 533-41 39 2012 35 534-40 40 2008 9 41 2012 54 34-43 42 2013 56 1072-81 43 2010 101 276-85 44 2011 12 45 2011 17 195-205 46 2008 58 436-8 47 2014 8 JC01-4 48 2014 15 49 2009 35 134-44 50 2012 85 651-66 51 2009 19 315-22 52 2012 38 155-62 53 2011 68 502-9 54 2008 34 374-80 55 2010 48 868-77 56 2013 23 1190-8 57 2012 41 2461-6 58 2009 21 252-8 59 2012 18 137-47 60 2013 14 61 2012 54 323-30 62 2011 27 275-81 63 2012 85 139-52 64 2014 56 204-8 65 2008 9 66 2011 6 67 2015 427-33 68 2015 16 69 2015 5 70 2012 54 16-24 71 1996 29 609-17 72 2001 74 549-57 73 2014 5 20-30 74 2010 35 173-81 75 2012 86 575-88 76 2012 55 670-81 77 2011 41 207-15 78 2012 43 3 3 298-303 79 2013 57 43-8