[1] Natl Inst Dent & Craniofacial Res, NIH, Craniofacial & Skeletal Dis Branch, Bethesda, MD 20892 USA
[2] Natl Univ Hosp, Finsen Ctr, Nordic Biosci AS, Copenhagen, Denmark
[3] Natl Univ Hosp, Finsen Ctr, Dept Radiat Biol, Copenhagen, Denmark
[4] Case Western Reserve Univ, Dept Orthopaed, Cleveland, OH 44106 USA
[5] Smithsonian Inst, Natl Museum Nat Hist, Washington, DC 20560 USA