Maintenance doses (n=20)
Twice-daily dose (μg)
Patients N (%)
Low-dose stratum 200 0
400 2 (10)
Medium-dose stratum 600 1 (5)
800 6 (30)
1000 7 (35)
High-dose stratum 1200 2 (10)
1400 2 (10)
1600 0