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BB and RO are joint first authors.
Contributors BB, RO, MP and EM contributed to the conception and design of the study. BB, RO, DL, CP, VG, DB, MP and EM contributed to the acquisition and analysis of data. BB, RO, DL, CP, MP and EM contributed to drafting the text and preparing the table.
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 Not required.
Ethics approval The study is part of a larger natural history study on SMA approved by the ethics committee of our institution and fully informed consent from the parents of participants was obtained before the study.
Provenance and peer review Not commissioned; externally peer reviewed.
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