[1] Virginia Commonwealth Univ, Dept Biomed Engn, 601 W Main St, Richmond, VA 23284 USA
[2] Georgia Inst Technol, Wallace H Coulter Dept Biomed Engn, 313 Ferst Dr, Atlanta, GA 30332 USA
[3] Emory Univ, 313 Ferst Dr, Atlanta, GA 30332 USA
[4] Univ Texas Hlth Sci Ctr San Antonio, Dept Periodontol, 7703 Floyd Curl Dr, San Antonio, TX 78229 USA