[1] KAROLINSKA SJUKHUSET, DEPT PEDIAT, PEDIAT ENDOCRINOL UNIT, STOCKHOLM 10401, SWEDEN
[2] UNIV N CAROLINA, SCH MED, LABS REPRODUCT BIOL, CHAPEL HILL, NC 27514 USA
[3] KAROLINSKA SJUKHUSET, SWEDISH MRC, REPRODUCT BIOL UNIT, STOCKHOLM 10401, SWEDEN
[4] UNIV N CAROLINA, SCH MED, DEPT PEDIAT, CHAPEL HILL, NC 27514 USA
[5] UNIV N CAROLINA, SCH MED, DEPT BIOCHEM, CHAPEL HILL, NC 27514 USA