Geographical patterns of human diet derived from stable-isotope analysis of fingernails - Nardoto, Gabriela Bielefeld; Silva, S; Kendall, C; Ehleringer, J. R; Chesson, L. A; Ferraz, Epaminondas Sansigolo de Barros; Moreira, Marcelo Zacharias; Ometto, Jean Pierre Henry Balbaud; Martinelli, Luiz Antonio (American Journal of Physical Anthropology, 2006)