1. Department of Nursing, University of Huelva, Huelva, Spain
2. Pneumology Service, Juan Ramón Jiménez Hospital, Huelva, Spain
3. Library, Juan Ramón Jiménez Hospital, Huelva, Spain
4. Andalusian Health Service e-Library, Seville, Spain
5. Centre for International Health, University of Bergen, Bergen, Norway
6. Department of Occupational Medicine, Haukeland University Hospital, Bergen, Norway
7. Department of Gynecology and Obstetrics, Haukeland University Hospital, Bergen, Norway
8. Department of Clinical Science, University of Bergen, Bergen, Norway