1. From the UCL Great Ormond Street Institute of Child Health, University College London, London, United Kingdom
2. Medical Research Council Clinical Trials Unit, Institute of Clinical Trials and Methodology, University College London, London, United Kingdom
3. Irkutsk AIDS Centre, Irkutsk Regional Centre for the Prevention and Control of AIDS and Infectious Diseases (IOC AIDS), Russia
4. Republican Clinical Hospital of Infectious Diseases, Saint Petersburg, Russia
5. The City HIV Centre, Saint Petersburg, Russia
6. Department of Children’s Infectious Diseases, Medical University of Warsaw; Hospital of Infectious Diseases in Warsaw, Poland
7. Pediatric Infectious Diseases, Hospital Gregorio Marañón, IISGM, UCM, CIBERINFEC ISCIII, Madrid, Spain
8. Institute for Global Health, University College London, London, United Kingdom.