public List<Patient> GetAllPatients()
{
    try
    {
        using (OptoEntities db = new OptoEntities())
        {
            List<Patient> list = db.Patients
                .Include("Addresses")
                .Include("PhoneNumbers")
                .Include("Examinations").ToList();

            list.ForEach(p =>
                             {
                                 p.ChangeTracker.ChangeTrackingEnabled = true;

                                 if (!p.Addresses.IsNull() &&
                                     p.Addresses.Count > 0)
                                     p.Addresses.ForEach(a => a.ChangeTracker.ChangeTrackingEnabled = true);

                                 if (!p.PhoneNumbers.IsNull() &&
                                     p.PhoneNumbers.Count > 0)
                                     p.PhoneNumbers.ForEach(a => a.ChangeTracker.ChangeTrackingEnabled = true);

                                 if (!p.Examinations.IsNull() &&
                                     p.Examinations.Count > 0)
                                     p.Examinations.ForEach(e =>
                                                                {
                                                                    e.ChangeTracker.ChangeTrackingEnabled = true;

                                                                });
                             });

            return list;
        }
    }
    catch (Exception ex)
    {
        return new List<Patient>();
    }
}