1. National Institutes of Health; National Center for Complementary and Integrative Health; 10 Center Drive Bethesda MD USA 20892
2. CIBER Epidemiología y Salud Pública (CIBERESP); Iberoamerican Cochrane Centre, Biomedical Research Institute Sant Pau (IIB Sant Pau); Sant Antoni Maria Claret, 167 Pavilion 18 (D-53) Barcelona Catalonia Spain 08025
3. Institute of Biomedical Research (IIB Sant Pau); Iberoamerican Cochrane Centre; Ed. Casa de Convalescència Sant Antoni M. Claret 171 4 planta Barcelona Spain E - 08041
4. Walter Reed National Military Medical Center; Darnall Medical Library; 8901 Wisconsin Avenue Building 1, Room 3458 Bethesda MD USA 20889
5. Technische Universität München; Department of Psychosomatic Medicine and Psychotherapy; Langerstr. 3 München Germany D-81675