Hubbard RE, Peel NM, Samanta M, Gray LC, Fries BE, Mitnitski A, Rockwood K.  2015.  Derivation of a frailty index from the interRAI acute care instrument. BMC Geriatr. 15:27.

Hubbard RE, Peel NM, Samanta M, Gray L.eonardC, Mitnitski A, Rockwood K.  2017.  Frailty status at admission to hospital predicts multiple adverse outcomes. Age Ageing. 46(5):801-806.