[1] PROFAMILIA,SANTO DOMINGO,DOMINICAN REP
[2] SHANGHAI INST MAT MED,SHANGHAI,PEOPLES R CHINA
[3] UNIV LAGOS,COLL MED,DEPT OBSTET & GYNECOL,LAGOS,NIGERIA
[4] UNIV IBADAN,UNIV COLL HOSP,DEPT OBSTET & GYNECOL,IBADAN,NIGERIA
[5] UNIV CHILE,FAC MED,DEPT OBSTET & GYNECOL,SANTIAGO 7,CHILE
[6] UNIV ASSIUT,SCH MED,DEPT OBSTET & GYNECOL,ASSIUT,EGYPT
[7] UNIV INDONESIA,FAC MED,DEPT OBSTET & GYNECOL,JAKARTA,INDONESIA
[8] INST NACL ENDOCRINOL,HAVANA,CUBA
[9] KENYA GOVT MED RES CTR,REPROD HLTH RES UNIT,NAIROBI,KENYA
[10] SOUTH SOUTH COOPERAT REPROD HLTH,SALVADOR,BA,BRAZIL