[1] Univ Sci & Technol China, Ctr Biomed Engn, Hefei 230027, Anhui, Peoples R China
[2] Univ Sci & Technol China, Dept Elect Sci & Technol, Hefei 230027, Anhui, Peoples R China
[3] Univ Washington, Dept Bioengn, Seattle, WA 98195 USA
[4] Univ Washington, Dept Engn Mech, Seattle, WA 98195 USA