run_exwas_cohort_left: Sensitivity analysis stratified by cohort
In groovearmada/exwas:

Run ExWAS for complete mids long format (stacked) imputed dataset stratified by cohort (one cohort is left in the analysis). BiB cohort is not analysed as the sample size is too small

1	run_exwas_cohort_left(input_data, variable_list, sdq, subcohort)

`input_data`	'mids' object imputed dataset
`variable_list`	A character vector containing a list of exposures for wich regressions will be run
`sdq`	A character vector indicating in the outcome SDQ score is external or internal
`subcohort`	A character vector specifying stratification to be made (one cohort left)

##---- Should be DIRECTLY executable !! ----
##-- ==>  Define data, use random,
##--	or do  help(data=index)  for the standard data sets.

## The function is currently defined as
function (x)
{
  }