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Das Gupta R, Sajal IH, Hasan M, Sutradhar I, Haider MR, Sarker M.Das Gupta R, et al. Among authors: haider mr.BMJ Open. 2019 Mar 20;9(3):e024680. doi: 10.1136/bmjopen-2018-024680.BMJ Open. 2019.PMID: 30898812Free PMC article.