private void GetIllnesses()
{
illnesses.Clear();
illnesses = fachkonzept.GetIllnesses().ToList();
illnessBindingSource.DataSource = illnesses;
illnessBindingSource.ResetBindings(false);
// get matching patients for first illness
Illness illness = illnesses.Count == 0 ? new Illness() : illnesses.First();
matchingPatients = fachkonzept.GetIllnessPatients(illness).ToList();
matchingPatientBindingSource.DataSource = matchingPatients;
matchingPatientBindingSource.ResetBindings(false);
}