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