Students

The initial data set consisted of 425 samples from individuals who reported a minimum of three generations of Lithuanian nationality. The average age of the participants was 53 years. Lithuania is divided in two main regions (Aukstaitija and Zemaitija), which can be further subdivided ethnolinguistically into six dialectal groups. We sampled three groups from Aukstaitija (western (n = 79), southern (n = 67), and eastern (n = 79)) and three groups from Zemaitija (northern (n = 79), western (n = 43), and southern (n = 78)) (Fig. 1). All the study participants provided written informed consent in accordance with the Declaration of Helsinki. <br>