1. Cochrane; Cochrane Response; St Albans House 57-59 Haymarket London UK SW1Y 4QX
2. University of Phillipines; Department of Surgery; Manila Philippines
3. University of Ottawa; Bruyère Research Institute; 43 Bruyère St Annex E, room 312 Ottawa ON Canada K1N 5C8
4. Ottawa Hospital Research Institute; Ottawa Methods Centre, Clinical Epidemiology Program; Ottawa Ontario Canada K1H 8L1
5. Liverpool School of Tropical Medicine; Department of Clinical Sciences; Pembroke Place Liverpool UK L3 5QA
6. World Health Organization; Initiative for Vaccine Research; Geneva Switzerland
7. University of Bern; Institute of Social and Preventive Medicine (ISPM); Finkenhubelweg 11 Bern Switzerland CH-3012