Authors: Arthur C Aufderheide; Wilmar Salo; Michael Madden; John Streitz; Jane Buikstra; Felipe Guhl; Bernardo Arriaza; Colleen Renier; Lorentz E Wittmers; Gino Fornaciari; Marvin Allison Journal: Proc Natl Acad Sci U S A Date: 2004-02-06 Impact factor: 11.205