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Medical, environmental and personal factors of disability in the elderly in Spain: a screening survey based on the International Classification of Functioning Javier Virués-Ortega, Jesús de Pedro-Cuesta, Jose Luis del Barrio, Javier Almazan-Isla, Alberto Bergareche, Felix Bermejo-Pareja, Gloria Fernández-Mayoralas, Francisco Jose García, Josep Garre-Olmo, Jordi Gascon-Bayarri, Ignacio Mahillo, Pablo Martínez-Martín, Raimundo Mateos, Fernanda Rodríguez, Fermina Rojo-Pérez, Fuencisla Avellanal, Pedro Saz, Manuel Seijo-Martínez