(Chapter 5) Footnote 32:

Vesalius cites Hippocrates’ Airs Waters Places, where see ch. 14 passim regarding the Scythian Makrokephaloi. Cf. also Soranus’ Gynecology 2.16.1.2ff. (Temkin 1956, 87): “Thracians and Macedonians ... tie down the newborn on a level board, so that the part around the neck and the back of the head may be flattened,” with the comment that this makes the head ugly.