Twin similarity for usage of common drugs.
D000428:Alcohol Drinking; D000704:Analysis of Variance; D003069:Coffee; D005260:Female; D006801:Humans; D006993:Hypnotics and Sedatives; D008297:Male; D008875:Middle Aged; D011247:Pregnancy; D012907:Smoking; D019966:Substance-Related Disorders / Q000235:genetics*; D013548:Sweden; D013662:Tea; D014427:Twins
D003069:Coffee; D006993:Hypnotics and Sedatives; D013662:Tea