- Asthma maintenance therapy: No changes in asthma maintenance therapy (excluding salbutamol inhalation aerosol provided at Visit 1) and control status during the run-in period. Asthma Control Questionnaire (ACQ-6 at screening and ACQ-7 at the end of the run-in period) will be used for the assessment of control status of asthma, i.e., 0.75 points shows controlled and >0.75 shows not well controlled.