The perinatal history, developmentalhistory and characteristics of regression were investigated. The symptoms were compared between the two groups.
调查患儿的围产期情况、发育史及发育倒退的特征，并对两组患儿的症状进行比较。
2
Developmental evaluation, evaluation, history assignment.
发展性评价；评价；历史作业。
3
Our results suggest that most aspects of tooth shape have the developmental potential for correlated changes during evolution which may, if not taken into account, obscure phylogenetic history.