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2. Understanding systematic reviews and meta-analysis;Akobeng;Archives of Disease in Childhood,2005
3. Intensive speech therapy for cleft palate children;Albery;British Journal of Disorders of Communication,1984
4. American Society of Plastic Surgeons 2010 Scale for grading practice recommendations http://www.plasticsurgery.org/Medical_Professionals/Health_Policy_and_Advocacy/Health_Policy_Resources/Evidence-based_GuidelinesPractice_Parameters/Description_and_Development_of_Evidence-based_Practice_Guidelines/ASPS_Grade_Recommendation_Scale.html