Syed Mustafa Ali Ahmad1, Raman Malhotra2. 1. Wye Valley NHS Trust, The County Hospital, Stonebow Road, Hereford, Herefordshire, HR1 2BN, UK. syedmustafa.aliahmad@gmail.com. 2. Queen Victoria Hospital NHS Trust, East Grinstead, West Sussex, RH19 3DZ, UK.