5Lichtenberg ES,Hill LJ,Howe M et al.A randomized comparison of propofol and methohexital as general anesthetics fo,rvacuum abortion.Controception,2003,68(3):211
6Vimala N,Mittal S,KumarS et al.A randomized comparison of sublingual and vaginal misoprostol for cervical priming before suction termination of first-trimester pregnancy.Contraception,2004,70(2):117