Solidaki E, Chatzi L, Bitsios P, Markatzi I, Plana E, Castro F. Work-related and psychological determinants of multisite musculoskeletal pain. Scand J Work Environ Health. 2010 Jan;36(1):54-61.
Rodriguez E, Ferrer J, Marti S, Zock JP, Plana E, Morell F. Impact of occupational exposure on severity of COPD. Chest. 2008 Dec;134(6):1237-43.