A feature of the current study was that it utilized a CATI. Compared to hard paper copy interviews, CATI-based assessment has a number of advantages including: (a) minimizing interviewer errors that may lead to subject recon-tacts or missing data; (b) improved querying of respondents about their symptom histories, through visual display to the interviewer; (c) rapid editorial review to respond to interviewer queries and provide interviewer feedback; (d) rapid consultation of the project clinician to resolve diagnostic questions: (e) ease of access to interviewer comments where these may help resolve diagnostic and other issues (whereas these are recorded in hardcopy interviews, they are rarely accessed, especially in international collaborations); (f) as a consequence of (e), greater ease of making data freely available to other investigators. The average length of the interview was 98 minutes.
