#' @param icd9Field The column in the data frame which contains the ICD codes.
#' This is a character vector of length one. If it is \code{NULL}, \code{icd9}
#' will attempt to guess the column name, looking for progressively less
#' likely possibilities until it matche a single column. Failing this, it will
#' take the first column in the data frame. Specifying the column using this
#' argument avoids the guesswork.
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