1. Bayer Wuppertal Germany
2. Bayer Whippany NJ USA
3. Bayer Basel Switzerland
4. Department of PediatricsUniversity of Arkansas for Medical Science and Arkansas Children's Research Institute Little Rock AR USA
5. University of Louisville/Kosair Charities Pediatric Clinical Research Unit/Norton Children's Hospital Louisville KY USA
6. Children's Hospital of Orange County Orange CA USA
7. University of CaliforniaSan Diego School of Medicine and Rady Children's Hospital San Diego San Diego CA USA