private void buildRequesters() {
   requesters = sampleRequesterDAO.getRequestersForSampleId(sampleId);
   for (SampleRequester requester : requesters) {
     if (requester.getRequesterTypeId() == Requester.PERSON.getId()) {
       Person person = personDAO.getPersonById(String.valueOf(requester.getRequesterId()));
       personService = new PersonService(person);
     } else if (requester.getRequesterTypeId() == Requester.ORGANIZATION.getId()) {
       organization =
           organizationDAO.getOrganizationById(String.valueOf(requester.getRequesterId()));
     }
   }
 }