“…These studies can be subdivided into 13 studies (5,7,9,11,12,15,17,19,22,32,35,36,39) investigating ragweed allergy (nine showing clinically relevant efficacy, i.e., symptom/medication scores diminished by >30% in the actively treated). Fifteen studies investigated the efficacy of immunotherapy in grass-pollen allergy (8,13,16,18,20,21,23,25,30,34,37,38,40,44,47), of which 14 proved efficacy. Nine studies investigated other pollen allergens: mountain cedar (10,27,29), Parietaria (42,43,46), Cupressus (45), Cocos (41), and mixtures (6); efficacy was demonstrated in six.…”