1. Health Information and Standards Directorate, Health Information and Quality Authority, Unit 1301, City Gate, Mahon, Cork T12 Y2XT, Ireland
2. Health Information and Standards Directorate, Health Information and Quality Authority, George’s Court, George’s Lane, Dublin 7 D07 E98Y, Ireland
3. Health Protection Research and Guideline Development Unit, Office of the National Clinical Director for Health Protection, 25-27 Middle Gardiner Street, Dublin 1, Ireland