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The flow chart of SNP selection for multivariate MR. SNPs are a set of instrumental variable related to FEV1 and/or FVC and/or FEV1/FVC. FEV1, forced expiratory volume in one second; FVC, forced vital capacity; FEV1/FVC, the ratio of FEV1 over FVC; SNP, single nucleotide polymorphism.
