Demographic, functional and clinical characteristics in hip fracture patients according to mental status of Spanish National Hip Fracture Registry Elena Romero Pisonero; Jesús Mora-Fernández; Rocío Queipo Matas; Juan Ignacio González Montalvo; Marta Neira Álvarez; Cristina Ojeda Thies; Pilar Sáez López; Vincenzo Malafarina;