1. Gupta R, Sheikh A, Strachan DP, Anderson HR. Increasing hospital admissions for systemic allergic disorders in England: analysis of national admissions data. BMJ 2003;327:1142–3
2. Strannegard O, Strannegard IL. The causes of the increasing prevalence of allergy: is atopy a microbial deprivation disorder? Allergy 2001;56:91–102
3. Mitchell G, Hernandez-Trujillo V, Liebermann P. Allergy. In: Rakel RE (ed) Textbook of family medicine. 7th ed. Saunders Elsevier 2007;26:463–75
4. Atkins D, Leung DYM. Principles of treatment of allergy disease. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF (eds): Nelson Textbook of Pediatrics. 18th ed. Saunders Elsevier 2007;141:942–4
5. Marstedt G, Moebus S. Inanspruchnahme alternativer Methoden in der Medizin. Gesundheitsberichterstattung des Bundes 2002; Heft 9, Robert Koch Institut Berlin