The authors would like to thank the following people for their help and
assistance:

  Christian Kleiber <kleiber@statistik.uni-dortmund.de>
  Henric Nilsson <henric.nilsson@statisticon.se>
  Giovanni Millo <Giovanni_Millo@generali.com>
  Hiroyuki Kawakatsu <hkawakat@qub.ac.uk>