[1] GOTHENBURG UNIV, DEPT PEDIAT, S-41124 GOTHENBURG, SWEDEN
[2] UNIV CHILE, DEPT PEDIAT, SANTIAGO, CHILE
[3] OLIVE VIEW UCLA MED CTR, DEPT PEDIAT, SYLMAR, CA 91342 USA
[4] UNIV CALIF LOS ANGELES, DEPT PEDIAT, LOS ANGELES, CA 90024 USA
[5] TOKYO METROPOLITAN KIYOSE CHILDRENS HOSP, TOKYO, JAPAN
[6] STANFORD UNIV, DEPT PEDIAT, STANFORD, CA 94305 USA
[7] CEDARS SINAI MED CTR, DEPT MED, LOS ANGELES, CA 90048 USA
[8] UNIV LONDON, INST CHILD HLTH, DEPT PEDIAT, LONDON WC1N 1EH, ENGLAND
[9] UNIV TUBINGEN, DEPT PEDIAT, TUBINGEN, GERMANY
[10] BAYSTATE MED CTR, DEPT PEDIAT, SPRINGFIELD, MA 01199 USA
[11] UNIV VIRGINIA, HLTH SCI CTR, DEPT PEDIAT, CHARLOTTESVILLE, VA 22908 USA
[12] UNIV N CAROLINA, DEPT PEDIAT, CHAPEL HILL, NC 27599 USA
[13] ROYAL CHILDRENS HOSP, MELBOURNE, VIC, AUSTRALIA