作者单位:Univ Chile, Fac Med, ICBM, Human Genet Program, Santiago 7, Chile[1]Univ Chile, Fac Med, ICBM, Morphol Program, Santiago 7, Chile[2]Univ Tarapaca, CIHDE, Arica, Chile[3]ru.ox.ac.uk[4]Univ Chile, Fac Social Sci, Dept Anthropol, Santiago 7, Chile[5]