1. University of Cambridge; The Primary Care Unit; Forvie Site Robinson Way Cambridge Cambridgeshire UK CB2 0SR
2. Università Cattolica del Sacro Cuore; Department of Psychology; Via Nirone 15, Milano Italy 20123
3. Harvard University; Department of Psychology; Cambridge Massachusetts USA
4. University Medical Center Goettingen; Department of Medical Statistics; Goettingen Germany
5. The Walton Centre NHS Foundation Trust; Lower Lane Fazakerley Liverpool UK L9 7LJ