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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 HE has received unrestricted educational funding from PAJUNK (Norcross, Georgia, USA), and consultant for Pacira Pharmaceuticals (Parsippany-Troy Hills, New Jersey, USA). AP consults for B. Braun Medical Ltd (Melsungen, Germany) and has received honoraria for teaching from GE Healthcare (Chicago, Illinois). None of the other authors has conflicts of interest to disclose.
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