[1] UNIV TEXAS, HLTH SCI CTR,SW MED SCH,DEPT OBSTET & GYNECOL, 5323 HARRY HINES BLVD, DALLAS, TX 75235 USA
[2] UNIV TEXAS, HLTH SCI CTR, SW MED SCH, DEPT BIOCHEM, DALLAS, TX 75235 USA
[3] CEN, INSERM, U244, F-38041 GRENOBLE, FRANCE
[4] UNIV TEXAS, HLTH SCI CTR, SW MED SCH, CECIL H & IDA GREEN CTR REPROD BIOL SCI, DALLAS, TX 75235 USA