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Karthikeyan MS, Vijaykumar P, Chandana L, Paul AB.Karthikeyan MS, et al.J Family Med Prim Care. 2021 Mar;10(3):1167-1170. doi: 10.4103/jfmpc.jfmpc_1363_20. Epub 2021 Apr 8.J Family Med Prim Care. 2021.PMID: 34041145Free PMC article.