A contribution to the problem of the biphalangy of the thumb.
D000293:Adolescent; D000367:Age Factors; D000886:Anthropometry; D002648:Child; D002675:Child, Preschool; D005260:Female; D005385:Fingers / Q000254:growth & development; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D012737:Sex Factors; D013933:Thumb / Q000033:anatomy & histology / Q000254:growth & development*