Footnotes

• Twitter @ollieosul

• Contributors CH and FS worked clinically with the patient to enable the CPET (and more!). OOS, PL and RBD performed the CPET. OOS drafted the manuscript with input from all authors. All authors agreed the final version. OOS acts as the guarantor.

• 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.

• Provenance and peer review Not commissioned; internally peer reviewed.