1 Department of Comprehensive Dentistry, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA. Electronic address: marinkovic@livemail.uthscsa.edu.
2 Department of Comprehensive Dentistry, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA; StemBioSys Inc., San Antonio, TX 78229, USA. Electronic address: travis.block@stembiosys.com.
3 Department of Electrical Engineering, University of Texas at Arlington, Arlington, TX 76109, USA. Electronic address: George.Kondraske@uta.edu.