[1] Watford Dist Gen Hosp, West Hertfordshire Hosp NHS Trust, Vicarage Rd, Watford WD18 0HB, Herts, England
[2] Lister Hosp, East & North Hertfordshire NHS Trust, Coreys Mill Lane, Stevenage SG1 4AB, Herts, England
[3] Eumedica SA, Chemin Nauwelette 1, B-7170 Manage, Belgium
[4] Barts & London Queen Marys Sch Med & Dent, Turner St, London E1 2AD, England