“…Reference data include 32 populations from: North-Western Italy, South-Eastern Italy and Sicily (21, Boattini et al, 2013;Sarno et al, 2014), French Basques (3, Martínez-Cruz et al, 2012, Germany (3, Ręba"a et al, 2013), Poland and Slovakia (4, Ręba"a et al, 2013), Balkans (1, Regueiro et al, 2012). A full list is available in Supplementary Table S1 and their geographic position is represented in Supplementary Figure S1.…”