#' Note that no argument to \code{IIV} is to be supplied as character but as symbols without quotation marks.
#'
#' Optionally, additional external instrumental variables to be used during the instrumental variable
#' regression and already present in the data can be specified, again separated by a vertical bar,
#' as the fourth right-hand side part.
#'
#' See the example section for illustrations on how to specify the \code{formula} parameter.
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