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Falling down and following up.
Wang C, Cai WP, Tucker JD, Li LH, Hu FY. Wang C, et al. Lancet. 2012 Sep 8;380(9845):948. doi: 10.1016/S0140-6736(12)60645-X. Lancet. 2012. PMID: 22959392 Free PMC article. No abstract available.
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