J. F. Gómez Montes, C.-L. Curcio, B. Alvarado, M. V. Zunzunegui, and J. Guralnik, “Validity and reliability of the Short Physical Performance Battery (SPPB): a pilot study on mobility in the Colombian Andes”., Colomb Med, vol. 44, no. 3, pp. 165–171, Sep. 2013.