1. RTI Health Solutions; Barcelona Spain
2. Department of Pediatrics; University of California, San Diego; La Jolla CA USA
3. Department of Epidemiology; Harvard School of Public Health; Boston USA
4. Meyers Primary Care Institute; University of Massachusetts Medical School; Worcester MA USA
5. Department of Pharmacy and Pharmacology; University of Bath; Bath UK
6. Department of Epidemiology and Biostatistics; University of South Florida, and ECC Population Health Group; St Petersburg USA
7. Departments of Pediatrics and Preventive Medicine; Vanderbilt University School of Medicine; Nashville TN USA