The changes of the calf-vein deformation and femoral vein peak velocity during ankle pump exercise with or without graduated compression stockings. - Zhuang, Zaikai; Ai, Dongmei; Yao, Yao; Zheng, Liming; Qin, Jianghui; Chen, Dongyang; Chai, Senlin; Lu, Jun; Jiang, Qing; Li, Xinhua (BMC Musculoskeletal Disorders, 2022)