Chunk #10 — Methods — Sample

Source

The association between DRD2/ANKK1 and genetically informed measures of alcohol use and problems.

Embedded

yes

Text

This was supplemented by parental information and comparisons of school photographs for the 2.9% (n=14) of twins whose zygosity could not be determined definitively from information in the questionnaires (Kaprio et al., 2002; Kaprio et al., 2006b) and later by DNA confirmation.