1. Academic Department of Respiratory Medicine, Hull and East Yorkshire Hospitals NHS Trust, University of Hull and Hull York Medical School, Castle Hill Hospital, Castle Road, Cottingham, East Yorkshire HU16 5JQ, United Kingdom
2. Department of Cardiothoracic Surgery, Hull and East Yorkshire Hospitals NHS Trust, University of Hull and Hull York Medical School, Castle Hill Hospital, Castle Road, Cottingham, East Yorkshire HU16 5JQ, United Kingdom