Heart Failure and Frailty in the Community-Living Elderly Population: What the UFO Study Will Tell Us oleh Erik Fung, Erik Fung, Erik Fung, Elsie Hui, Elsie Hui, Xiaobo Yang, Xiaobo Yang, Xiaobo Yang, Leong T. Lui, Leong T. Lui, King F. Cheng, King F. Cheng, Qi Li, Qi Li, Qi Li, Yiting Fan, Yiting Fan, Daljit S. Sahota, Bosco H. M. Ma, Bosco H. M. Ma, Jenny S. W. Lee, Jenny S. W. Lee, Alex P. W. Lee, Jean Woo, Jean Woo