16S ribosomal RNA sequencing of the V3-V4 region was performed by PCR. Sequencing library was generated and quality was assessed by Quant-iT PicoGreen (Invitrogen, USA). Then the library was sequenced
16S ribosomal RNA sequencing of the V3-V4 region was performed by PCR. Sequencing library was generated and quality was assessed by Quant-iT PicoGreen (Invitrogen, USA). Then the library was sequenced