St George's Vaccien Institute, London, United Kingdom
Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom
Health Protection Agency, Immunisation Department, Colindale, London, United Kingdom
Multiple General Practice surgeries, Hertford, Hertfordshire, United Kingdom
Ealing Hospital, Southall, London, United Kingdom
St George's Hospital, Tooting, London, United Kingdom
Homerton Hospital, London, United Kingdom
Health Protection Agency, London, United Kingdom
Professor Elizabeth Miller, Gloucester, United Kingdom
Public Health England, London, United Kingdom
Health Protection Agency, London, United Kingdom
Health Protection Agency, London, United Kingdom
Health Protection Agency, Manchester Laboratory., Manchester, United Kingdom