public override void Invoke(AWSCredentials creds, RegionEndpoint region, int maxItems)
        {
            AmazonRoute53Config config = new AmazonRoute53Config();

            config.RegionEndpoint = region;
            ConfigureClient(config);
            AmazonRoute53Client client = new AmazonRoute53Client(creds, config);

            ListHealthChecksResponse resp = new ListHealthChecksResponse();

            do
            {
                ListHealthChecksRequest req = new ListHealthChecksRequest
                {
                    Marker = resp.NextMarker
                    ,
                    MaxItems = maxItems.ToString()
                };

                resp = client.ListHealthChecks(req);
                CheckError(resp.HttpStatusCode, "200");

                foreach (var obj in resp.HealthChecks)
                {
                    AddObject(obj);
                }
            }while (!string.IsNullOrEmpty(resp.NextMarker));
        }