“…Some of the studies in Table 1 are longitudinal observational studies, following their sample from 1 month 10 until adulthood, and presenting data at 9 years of age 6,8,16,22 . Certain studies compared their group with normative data for a noncleft population 8,9,13,16,19,22 , or with the protocols of other centres 5,8 . In other studies, different treatment approaches within the same cleft centre were compared 6,15,19,22 .…”