Study	Reason for exclusion
Orriols 1999	Did not meet inclusion criteria for the intervention. Nebulised dual antibiotic vs symptomatic treatment (i.e. comparison arm was not given a monotherapy antibiotic)
Orriols 2015	Did not meet inclusion criteria for the intervention. The study compared nebulised dual antibiotics with symptomatic treatment (i.e. comparison arm was not given a monotherapy antibiotic)
Takamoto 1994	The intervention was not exclusively restricted to participants with bronchiectasis, and it is unclear whether the study was randomised. We were unable to contact trial authors for clarification on study design or data on participants with bronchiectasis alone
Vergnon 1985	The intervention was not exclusively restricted to participants with bronchiectasis, and we were unable to contact trial authors for data on these participants alone
Watanabe 1990	The intervention was not exclusively restricted to participants with bronchiectasis, and it is unclear whether the study was randomised. We were unable to contact trial authors for clarification on study design or data on participants with bronchiectasis alone