1 Department of Behavioural Science and Health, University College London, London WC1E 6BT, UK; SPECTRUM Consortium, London, UK. Electronic address: lion.shahab@ucl.ac.uk.
2 Division of Epidemiology and Public Health, University of Nottingham, Nottingham, UK; SPECTRUM Consortium, London, UK.
3 Department of Behavioural Science and Health, University College London, London WC1E 6BT, UK; SPECTRUM Consortium, London, UK.
4 Health and Lifestyle Research Unit, Queen Mary University of London, London, UK.
5 Department of Addictions, King's College London, London, UK; SPECTRUM Consortium, London, UK.