Figure 1: Time schedule and major observations of the study. Grass allergy immunotherapy tablet (AIT) was first administered in the clinic between November 2008 and March 2009 at visit 1 (V1). Patients visited the allergist’s office subsequently about every 3 months at visit 2 (V2), visit 3 (V3) and visit 4 (V4) for an observation period of up to 9 months. The final visit was performed after the grass pollen season (GPS). In case that V3 was after GPS, V4 was omitted. ADR=Adverse drug reaction.