Acupuncture for Seasonal Allergic Rhinitis

arm 1: verum acupuncture group: 12 interventions (semi-standardised): 8 in the first 4 weeks and 4 in the next 4 weeks + rescue medication (up to 2 doses of second-generation oral antihistamines daily (e.g. 2 x 1 cetirizine dihydrochloride/daily))

arm 2: minimal (sham) acupuncture group: 12 interventions (standardised): 8 in the first 4 weeks and 4 in the next 4 weeks + rescue medication (up to 2 doses of second-generation oral antihistamines daily (e.g. 2 x 1 cetirizine dihydrochloride/daily))

arm 3: rescue medication (up to 2 doses of second-generation oral antihistamines daily (e.g. 2 x 1 cetirizine dihydrochloride/daily)) alone