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COPD-OSA overlap research

We are designing a study investigating the benefit of positive airway pressure (PAP) therapy in patients with chronic obstructive pulmonary disease (COPD).  As experts in the field we would appreciate your input into this and would be grateful if you could complete the survey below. The survey should take less than 3 minutes to complete.
1.Your current role
2.Age
3.Gender
4.Do you currently screen patients with COPD and a history of exacerbations for co-morbid OSA in routine clinical practice??(Required.)
5.If considering a diagnosis of OSA in a patient admitted with an acute exacerbation of COPD would you, would you complete sleep studies as an inpatient?
6.If considering a diagnosis of OSA in a patient admitted with an AECOPD would you complete a sleep study as an outpatient?
7.If you undertake sleep studies as an outpatient, how many weeks would you usually wait following an exacerbation to complete a sleep study?
8.What clinical features would make you consider screening for OSA in a patient with COPD?
9.Would you randomise a patient with COPD and OSA (AHI >15/h) detected via screening (i.e not presenting with sleep symptoms) to no positive airway pressure therapy for 12 months?
10.Would you randomise a patient with COPD and OSA (AHI >15/h) detected via screening but reporting moderate excessive daytime sleepiness (Epworth Sleepiness Score 11-15) to no positive airway pressure therapy for 12 months?
11.If no to question 9 what Epworth Sleepiness Score threshold would you randomise patients(Required.)
12.What reduction in number of exacerbations per year would you feel is clinically relevant?
13.Would a between group reduction of 0.7 exacerbations per patient per year be sufficient for you to recommend PAP therapy if the patient had OSA but no other symptoms of OSAS?