public RegistrantList getRegistrantList(int aiMaxSize, String asLastModified) {
        String lsParam = "";
        if (aiMaxSize > 0) {
            lsParam += "&max_size=" + Integer.toString(aiMaxSize);
        }
        if (UtilityMethods.isValidString(asLastModified)) {
            lsParam += "&last_modified=" + asLastModified;
        }

        if (UtilityMethods.isValidString(lsParam)) {
            lsParam = lsParam.replaceFirst("&", "?");
        }

        return get(RegistrantList.class, REST_URL_REGISTRATION + lsParam);
    }