Correspondence should be sent to Dr Matthias Axt, MD, Orthopaedic Department at The Children’s Hospital at Westmead, Corner Hawkesbury Road and Hainsworth Street, Locked Bag 4001, Westmead NSW 2145, Sydney, Australia. E-mail:

E-mail Address: [email protected]

https://orcid.org/0000-0002-0507-3597

Orthopaedic Department at The Children’s Hospital at Westmead, Westmead NSW, Sydney, Australia