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Compliance, blinding and side-effects. a) Ridge plot of daily inhalations in the formoterol and placebo groups. Participants were instructed to administer inhalations between the daily hours of 06:00 and 11:00 as well as 16:00 and 20:00. All participants’ daily inhalations were supervised by online video calls. Specific inhalation time points for two participants in the formoterol group are missing. b) Blinding and side-effects.
