Sezgin, D., O'Donovan, M., Wong, J. W., Bandeen-Roche, K., Liotta, G., Fairhall, N., Laso, A. R., Apóstolo, J., Clarnette, R., Holland, C., Roller-Wirnsberger, R., Illario, M., Mañas, L. R., Vollenbroek-Hutten, M., Yavuz, B. B., Balci, C., Pernas, F. O., Paul, C., Ahern, E., Romero-Ortuno, R., Molloy, W., Cooney, M. T., O'Shea, D., Cooke, J., Lang, D., Hendry, A., Rockwood, K., Clegg, A., Liew, A., & O'Caoimh, R. (n.d.). 269 Early Identification of Frailty: Developing an International Delphi Consensus for a Definition of Pre-frailty. Age and ageing, 48, iii17–iii65. http://access.bl.uk/ark:/81055/vdc_100095477883.0x000064