A study protocol for development and validation of a clinical prediction model for frailty (ModulEn): A new European commitment to tackling frailty - Apostolo, J.; Bobrowicz-Campos, E.; Moreno-Casbas, T.; Teixeira-Santos, L.; Sánchez de M.R.; Casado-Ramírez, E.; Couto, F. (Translational Medicine @ UniSa, 2019)