Airway Disease Section, Asthma Lab, Imperial College London, Royal Brompton Hospital, London, United Kingdom
Glenfield Hospital, Leicester, Leicester, United Kingdom
Heart Hospital, University College Hospital, London, United Kingdom
St. Mary's Hospital, London, United Kingdom
Khayelitsha Midwive and Obstetric Unit Site B, Cape Town, Western Cape, South Africa
Biomedical Research and Training Institute, Harare, Zimbabwe
Ealing Hospital, London, United Kingdom
West Middlesex University Hospital, Greater London, Middlesex, United Kingdom
Hillingdon Hospital, Uxbridge, United Kingdom
Imperial College London, Hammersmith, London, United Kingdom
Imperial College London, London, United Kingdom
Imperial College London, London, United Kingdom
Medical Research Council Field Station, Farafenni, Central River Division, Gambia
Section of Airway Disease, Asthma Lab, Imperial College London, Royal Brompton Hospital, London, United Kingdom