private void AddPatientIdentifier(PatientIdentifierDto patientIdentifierDto, Patient patient)
{
var patientIdentifierType = _mappingHelper.MapLookupField <PatientIdentifierType> (patientIdentifierDto.PatientIdentifierType);
var patientIdentifier = new PatientIdentifierBuilder()
.WithPatientIdentifierType(patientIdentifierType)
.WithIdentifier(patientIdentifierDto.Identifier)
.WithEffectiveDateRange(new DateRange(patientIdentifierDto.EffectiveDate, patientIdentifierDto.ExpirationDate))
.WithDescription(patientIdentifierDto.Description)
.WithActiveIndicator(patientIdentifierDto.ActiveIndicator)
.Build();
patient.AddPatientIdentifier(patientIdentifier);
}