Return nested complex types from WCF WebGet - wcf

Question

I've created a wcf data service to return a List of complex type patient. I used the model browser to create a complex type for "Patient" and a complex type for "Contact". I'd like to add a "Contacts" property to "Patient", which would be a List.
How do I add a nested complex type list as a property and return it?
[WebGet]
public List<Patient> GetPatientByID(int tolid)
{
List<Patient> list = new List<Patient>();
// create pds user session record
SqlConnection conn = new SqlConnection("Data Source=server;Initial Catalog=db;User ID=<ID>;Password=<pwd>");
SqlCommand cmd = new SqlCommand();
try
{
// open the connection
conn.Open();
// configure the command
cmd.Connection = conn;
cmd.CommandText = "sp_tol_patient_select";
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.Parameters.Add(new SqlParameter("tolid", tolid));
// execute the command and convert the decimal value
// returned by ExecuteScalar to an int to get new identity value
SqlDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
Patient itm = new Patient();
itm.MRN = reader["UNITNUMBER"].ToString();
itm.AccountNum = reader["ACCTNUM"].ToString();
itm.FullName = reader["PATNAME"].ToString();
itm.BirthDate = reader["BIRTHDATE"].ToString();
itm.Gender = reader["SEX"].ToString();
list.Add(itm);
}
return list;
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
cmd.Dispose();
conn.Close();
}
}