Association of sagittal spinal alignment with thickness and echo intensity of lumbar back muscles in middle-aged and elderly women - Masaki, M; Ikezoe, T; Fukumoto, Y; Minami, S; Tsukagoshi, R; Sakuma, K; Ibuki, S; Yamada, Y; Kimura, M; Ichihashi, N (Arch Gerontol Geriatr, 2015)