1. Proportion of patients in south London with first-episode psychosis attributable to use of high potency cannabis: a case-control study Dr Marta Di Forti, MD, Arianna Marconi, MD, Elena Carra, MD, Sara Fraietta, MD, Antonella Trotta, MSc, Matteo Bonomo, MSc, Francesca Bianconi, MSc, Poonam Gardner-Sood, PhD, Jennifer O'Connor, PhD, Manuela Russo, PhD, Simona A Stilo, MD, Tiago Reis Marques, PhD, Valeria Mondelli, PhD, Paola Dazzan, PhD, Prof Carmine Pariante, PhD, Prof Anthony S David, MD, Fiona Gaughran, MD, Zerrin Atakan, MD, Conrad Iyegbe, PhD, Prof John Powell, DPhil, Prof Craig Morgan, PhD, Prof Michael Lynskey, PhD, Prof Robin M Murray, FRS The Lancet Psychiatry Volume 2, Issue 3, Pages 233-238 (March 2015) DOI: 10.1016/S2215-0366(14)00117-5 Copyright © 2015 Di Forti et al. Open Access article distributed under the terms of CC BY Terms and Conditions Terms and Conditions

2. Figure 1 The Lancet Psychiatry 2015 2, 233-238DOI: (10.1016/S2215-0366(14)00117-5) Copyright © 2015 Di Forti et al. Open Access article distributed under the terms of CC BY Terms and Conditions Terms and Conditions

3. Figure 2 The Lancet Psychiatry 2015 2, 233-238DOI: (10.1016/S2215-0366(14)00117-5) Copyright © 2015 Di Forti et al. Open Access article distributed under the terms of CC BY Terms and Conditions Terms and Conditions