Can thiệp lâm sàng không nhóm đối chứng, kết hợp theo dõi dọc, tiến cứu (Fallow – up – Studies in the future). Đánh giá kết quả qua 4 mức độ: rất tốt, tốt, trung bình và kém.
Clinical intervention team, not matching the longitudinal tracking, advanced research (Fallow-up-Studies in the future). Reviews the results through 4 levels: very good, good, average and poor.
Clinical intervention control group, combining vertical track, prospective (Fallow - up - Studies in the future). Assessment results over 4 levels: very good, good, average and poor.