Seminars in Liver Disease, Table of Contents Semin Liver Dis 1998; 18(4): 426DOI: 10.1055/s-2007-1007176 LETTER TO THE EDITOR © 1998 by Thieme Medical Publishers, Inc.Authors' ResponseTimothy M. Cox, Paul G.N. Norris University of Cambridge, Addenbrooke's Hospital Recommend Article Abstract Buy Article See also:ProtoporphyriaSemin Liver Dis 1998; 18(01): 85-93DOI: 10.1055/s-2007-1007144 Full Text