The proportion of each subgroup was 27.7%(Ic),33.6%(Is),2.5%(IIc),24.4%(IIs),and 11.8%(IVc),respectively.

• 各亚群的比例分别是 :Ic 2 7 7%25、Is 33 6%25、IIc 2 5%25、IIs 2 4 4%25、IVc 11 8%25。