Table 1. Selection process of eligible 3D images of healthy control subjects.

Age	3 months	6 months	9 months	12 months	Total
Children in database (n = 50)	44	42	47	44
3D images in database	165	144	144	162	615
Excluded images due to exclusion criteria	85	87	81	119	372
Exclusion of double images	48	37	32	19	136
Included 3D images	32	20	31	24	107