Map data in Vonk FHIR Facade

Vonk.Facade.Starter.MapPatient.cs

public IResource MapPatient(ViSiPatient source)
{
    var patient = new Patient();
    patient.Id = source.Id.ToString();
    patient.Identifier.Add(new Identifier("http://mycompany.org/patientnumber", source.PatientNumber));
    patient.Name.Add(new HumanName().WithGiven(source.FirstName).AndFamily(source.FamilyName));
    patient.BirthDate = new FhirDateTime(source.DateOfBirth).ToString();
    patient.Telecom.Add(new ContactPoint(ContactPoint.ContactPointSystem.Email, ContactPoint.ContactPointUse.Home, source.EmailAddress));
    return patient.AsIResource();
}