[1] SHATBY HOSP,ALEXANDRIA,EGYPT
[2] UNIV FED BAHIA,MATERNIDADE CLIMERIO OLIVEIRA,SALVADOR,BA,BRAZIL
[3] SIRIRAJ HOSP,BANGKOK,THAILAND
[4] SETH GS MED COLL,BOMBAY 400012,INDIA
[5] POSTGRAD INST MED EDUC & RES,CHANDIGARH 160012,INDIA
[6] UNIV WESTERN ONTARIO,DEPT OBSTET & GYNAECOL,LONDON N6A 3K7,ONTARIO,CANADA
[7] INST NACL NUTR,MEXICO CITY 22,DF,MEXICO
[8] UNIV CHILE,DEPT OBSTET & GYNAECOL,SANTIAGO,CHILE
[9] UNIV SO CALIF,WOMENS HOSP,SCH MED,LOS ANGELES,CA 90007
[10] UNIV ZAMBIA,DEPT OBSTET & GYNAECOL,LUSAKA,ZAMBIA
[11] SEOUL NATL UNIV,INST REPRODUCT MED & POPULAT,SEOUL,SOUTH KOREA
[12] KANDANG KERBAU HOSP,DEPT OBSTET & GYNAECOL,SINGAPORE,SINGAPORE
[13] KAROLINSKA HOSP,REPRODUCT ENDOCRINOL RES UNIT,S-10401 STOCKHOLM,SWEDEN
[14] UNIV SYDNEY,DEPT OBSTET & GYNAECOL,SYDNEY,NSW 2006,AUSTRALIA
[15] SOUTHWEST FDN RES,SAN ANTONIO,TX