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Twitter Miguel Pereira @neur0ghost
Contributors MP: Study concept and design, acquisition of data, analysis and interpretation, drafting/revising the manuscript for content. JD: revising the manuscript for content. MdCM: acquisition of data, analysis and interpretation of data, revising the manuscript for content.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent for publication Parental/guardian consent obtained.
Provenance and peer review Not commissioned. Externally peer reviewed by Henry Houlden, London, UK, and Richard Appleton, Liverpool, UK.