1. TeraView Limited, Platinum Building, St John's Innovation Park, Cambridge, CB4 0WS, UK (V.P.W., A.J.F., P.F.T.); Semiconductor Physics Group, Cavendish Laboratory, Madingley Road, Cambridge, CB3 0HE, UK (E.P.); BUPA Cambridge Lea Hospital, Impington, Cambridge CB4 9EL, UK (R.J.P.); and Department of Dermatology, Addenbrooke's Hospital, Cambridge, CB2 2QQ, UK (N.F., T.H.)