Effects of FOXO genotypes on longevity: A biodemographic analysis - Yi Zeng; Lingguo Cheng; Huashuai Chen; Huiqing Cao; Elizabeth R. Hauser; Yuzhi Liu; Zhenyu Xiao; Qihua Tan; Xiao-Li Tian; James W. Vaupel (Journals of Gerontology - Series A Biological Sciences and Medical Sciences, 2010)