[1] Natl Inst Dent & Craniofacial Res, NIH, DHHS, Bethesda, MD USA
[2] Univ Texas, Hlth Sci Ctr Houston, Dent Branch, Houston, TX USA
[3] Univ Texas, Hlth Sci Ctr San Antonio, San Antonio, TX USA
[4] Univ N Carolina, Sch Dent, Chapel Hill, NC USA
[5] Univ Maryland, Baltimore, MD 21201 USA