From the Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham NHS Foundation Trust (RS), Chelsea and Westminster Hospital, Chelsea and Westminster NHS Foundation Trust (SMC), Sandwell General Hospital, City and Sandwell Hospitals NHS Trust (EB), Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham NHS Foundation Trust (RM), University Hospitals Birmingham NHS Foundation Trust, Bournville, UK (TT)

Correspondence to Tomasz Torlinski, MD, PhD, FFICM, University Hospitals Birmingham NHS Foundation Trust, Birmingham, West Midlands, UK. E-mail: [email protected]