#' @param poa single character value, being one of \code{Yes}, \code{No},
#' \code{NotYes}, and \code{NotNo}, indicating whether to account for
#' comorbidities flagged as present-on-arrival. This is not a simple flag,
#' because many codes are exempt, unspecified, or unknown. The intermediate
#' codes, such as \sQuote{exempt}, \sQuote{unknown} and \code{NA} mean that
#' \sQuote{yes} is not the same as \sQuote{not no}.
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