Nothing
#' Get a PMID from a DOI, and vice versa.
#'
#' @export
#' @rdname pmid2doi-defunct
#' @keywords internal
`pmid2doi` <- function(...){ # nocov start
.Defunct(msg = "The web API behind this function is down indefinitely,
see id_converter()")
} # nocov end
#' @export
#' @rdname pmid2doi-defunct
`doi2pmid` <- function(...){ # nocov start
.Defunct(msg = "The web API behind this function is down indefinitely, see id_converter()")
} # nocov end
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