FIGURE 1.

A map of the Netherlands with localities where the individuals (n = 38) lived during formation of their third molars. F3 = Holwerd; F2, F6, F8, F9, F11, F13 = Leeuwarden; F7 = Wijnaldum; F12 = Oldeboorn; F1 = Lippenhuizen; D15 = Veenhuizen; D3 = Smilde; A27 = Alkmaar; 9 = Amsterdam; T2, T6 = Hengelo; T1 = Enschede; D13 = Den Haag; R9, R11, R13, R17, R18 = Rotterdam; R7 = Dordrecht; ZH1, ZH3, ZH4, ZH6, ZH9 = Heerlen; M2, M4, M5, M6, M7, M8, M10, M14, and M18 = Maastricht