# A tibble: 163 x 9
PMID `sequencing type` `16S variable r… `sequencing pla… `study design` `matched on` `confounders contr… `antibiotics exc… Country
<chr> <fct> <fct> <fct> <fct> <chr> <chr> <chr> <chr>
1 28038… NA NA DNA-DNA Hybridi… case-control NA NA 3 months United…
2 28173… 16S V4 Roche454 case-control NA NA Not stated Denmark
3 27015… 16S NA Roche454 case-control NA NA within preceding… United…
4 27625… 16S NA RT-qPCR time series / … NA NA NA Finland
5 23071… 16S V1-V2 Roche454 case-control NA NA 3 months United…
6 28467… 16S V4-V5 Roche454 case-control gender, age,… NA NA United…
7 20603… 16S Tuf gene Non-quantitativ… case-control NA age; Controls subj… less than one mo… France
8 20140… 16S V3 Roche454 case-control NA NA 3 months China
9 29190… 16S V1-V2 Roche454 cross-sectiona… NA free from disease,… 6 months United…
10 29234… 16S NA Illumina case-control NA NA 3 months Brazil
# … with 153 more rows
Warning messages:
1: In FUN(X[[i]], ...) :
PMIDs 23032991, 28018325, 29207565, 29234019, 30497517 with >1 unique study design .
Chosing the first one for each of them.
2: In FUN(X[[i]], ...) :
PMIDs 28173873, 28620208, 28875948, 29051531, 29922272, 30535886 with >1 unique matched on .
Chosing the first one for each of them.
3: In FUN(X[[i]], ...) :
PMIDs 25763184, 26230509, 28035686, 28390422, 28875948, 29538354, 29922272, 30714640 with >1 unique confounders controlled for .
Chosing the first one for each of them.
4: In FUN(X[[i]], ...) :
PMIDs 25710027, 25763184, 26151645, 26600078, 28390422, 28512451, 28875948, 30279332, 30548192 with >1 unique antibiotics exclusion .
Chosing the first one for each of them.
5: In FUN(X[[i]], ...) : PMIDs 28390422, 28968427 with >1 unique Country .
Chosing the first one for each of them.