run_exwas_mids: Run an ExWAS on an inputed 'mids' object
In groovearmada/exwas:

Run an ExWAS for each exposure and SDQ outocme at a time. The outcome are IRR coefficients with 95 perc CI

1	run_exwas_mids(input_data, variable_list, sdq, subcohort = NULL)

`input_data`	mids imputed object
`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 no stratification to be made

##---- 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)
{
  }