List of potential contaminating genera present in extraction reagents (Table S1); genera enriched in sPTB versus nsPTB placentas (Tables S2 and S4) and sPTB versus term placentas (Tables S3 and S5); R2 values for comparisons of three diversity metrics (Table S6); list of packages and versions used in statistical and bioinformatics analyses within R 3.4.3.
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