1 “...Learning disabilities are among the most common disabilities experienced in childhood and adulthood...”

2 “...Learning disabilities are among the most common disabilities experienced in childhood and adulthood...”

3 “...Missing values and dropouts are common issues in longitudinal studies in all areas of medicine...”

4 “...Missing values and dropouts are common issues in longitudinal studies in all areas of medicine...”

5 “... communities to prevent and respond to the problem. We recommend using a comprehensive surveillance system...”

6 “... communities to prevent and respond to the problem. We recommend using a comprehensive surveillance system...”