19=180,1,2; 20=182,1,2; 21=184,1,S; 22=185,6,S; 23=187,6,Suppl.; 24=189,6,Suppl.; 25=191,6,Suppl.; 26=193,6,Suppl.; 27=195,6,Suppl.; 28=197,6,Suppl.; 29=199,6A,Suppl.; 30=201,6,Suppl. von: American journal of obstetrics & gynecology (ISSN: 0002-9378)