add Pat's suggestions, added line numbers, and small edits
add Pat's suggestions, added line numbers, and small edits

SchlossLab/Sze_FollowUps_Microbiome_2017,SchlossLab/Sze_FollowUps_Microbiome_2017,SchlossLab/Sze_FollowUps_Microbiome_2017