Table 1 Quality characteristics of this study [12, 14]

Literature review conducted

Yes

Background information provided to respondents

Yes

Purpose is item generation or ranking or both

Yes

Number of respondents indicated

Yes

Number of respondents for round 1 indicated

Yes

Number of respondents for round 2 indicated

Yes

Were criteria used for respondents reproducible^a

No

Polling described

Yes

Private decisions collected (anonymity)

Yes

Formal feedback of group ratings

Yes, after round 1

Number of rounds conducted 2 or more

Yes

Number of rounds determined a priori

Yes

Predetermined definition of consensus

Yes

Consensus forced

Yes

Were criteria used for dropping items clear?^a

Yes

Stopping criteria other than rounds specified?^a

Yes