Split graph of the cohort reconstructed using the Kimura-2-parameter corrected distances. The splits were refined since this significantly improved the fit. Bootstrap values are indicated on the edges and were performed using the Neighbor-Joining method on 1000 replicates (previously published in Mikhail et al., 2005). Bayesian trees were reconstructed in mrBayes v2.01. Network analysis was performed in Splitstree v 1.0.1, 2.4; Huson 1998).