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| Country | Study design | Follow-up period | Resolution (%) |
|---|---|---|---|
| Canada13 | High-risk birth cohort with intervention | Birth to 7 years of age | 58% |
| Taiwan14 | Population based birth cohort | Birth to 10 years of age | 69.8% |
| Germany9 | Birth cohort | Birth to 7 years of age | 43.2% at the age of 3 years |
| Italy16 | Long-term follow-up | Over 20 years | 60.5% at the age of 6 years |
