Diagnosis of Sarcopenia Using Convolutional Neural Network Models Based on Muscle Ultrasound Images: Prospective Multicenter Study - Zi-Tong Chen; Xiao-Long Li; Feng-Shan Jin; Yi-Lei Shi; Lei Zhang; Hao-Hao Yin; Yu-Li Zhu; Xin-Yi Tang; Xi-Yuan Lin; Bei-Lei Lu; Qun Wang; Li-Ping Sun; et al. (Journal of Medical Internet Research)