Peking University, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Washington - Department of Psychiatry and Behavioral Sciences, Harvard Medical School - The Pershing Square Professor of Global Health, University of Oxford - Department of Psychiatry, University of Melbourne - Melbourne School of Population and Global Health, King’s College London, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Peking University - Institute of Mental Health, Peking University - National Institute on Drug Dependence, Baylor University - Department of Psychiatry, Peking University - National Institute on Drug Dependence and Peking University - School of Public Health