In April 2008, "The Times" published a letter from Edzard Ernst, Professor of Complementary Medicine at the University of Exeter, which asked the Prince's Foundation to recall two guides promoting alternative medicine, saying "the majority of alternative therapies appear to be clinically ineffective, and many are downright dangerous." A speaker for the foundation countered the criticism by stating: "We entirely reject the accusation that our online publication "Complementary Healthcare: A Guide" contains any misleading or inaccurate claims about the benefits of complementary therapies. On the contrary, it treats people as adults and takes a responsible approach by encouraging people to look at reliable sources of information ... so that they can make informed decisions. The foundation does not promote complementary therapies." That year, Ernst published a book with Simon Singh, mockingly dedicated to "HRH the Prince of Wales", called "Trick or Treatment: Alternative Medicine on Trial". The last chapter is highly critical of Charles's advocacy of complementary and alternative treatments.