code: function getSubmissionFile(req, res, next) {
    var params = {"_id": req.params.fileId};
    logger.debug("Middleware getSubmissionFile ", {params: params});
    forms.getSubmissionFile(req.connectionOptions, params, submissionsHandler(constants.resultTypes.submissions, req, next));
  }
docs: Get A Single Submission File
  @param req
  @param res
  @param next