1. School of Dentistry, The University of Manchester; Orthodontics; Higher Cambridge Street Manchester UK M15 6FH
2. Glan Clwyd Hospital; Department of Orthodontics; Rhyl UK LL18 5UJ
3. Foresterhill Health Centre; Department of General Practice and Primary Care; Westburn Road Aberdeen UK AB25 2AY
4. Newcastle Dental Hospital; Department of Orthodontics; Richardson Road Newcastle upon Tyne UK NE2 4AZ
5. University Dental School and Hospital; Department of Oral Health and Development; Wilton, Cork Ireland
6. School of Dentistry, The University of Manchester; Cochrane Oral Health Group, MANDEC; Higher Cambridge Street Manchester UK M15 6FH