@ApiMethod(
      summary = APIDoc.SUM_DELETE_KNOWLEDGE,
      responsestatuscode = APIDoc.STATUS_DELETE_KNOWLEDGE)
  @RequestMapping(value = "/user/{idUser}/knowledge/{idArea}", method = RequestMethod.DELETE)
  public HttpEntity deleteKnowledge(
      @PathVariable("idUser") Long idUser, @PathVariable("idArea") Long idArea) {
    if (!Utils.verifyParamEmptyOrNull(idUser) || !Utils.verifyParamEmptyOrNull(idArea))
      return new ResponseEntity(HttpStatus.BAD_REQUEST);

    if (service.delete(idArea, idUser)) return new ResponseEntity(HttpStatus.OK);
    else return new ResponseEntity(HttpStatus.NOT_MODIFIED);
  }