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Wang GJ, Volkow ND, Logan J, Pappas NR, Wong CT, Zhu W, Netusil N, Fowler JS.Wang GJ, et al. Among authors: pappas nr.Lancet. 2001 Feb 3;357(9253):354-7. doi: 10.1016/s0140-6736(00)03643-6.Lancet. 2001.PMID: 11210998