In 1995, The Group for the Scientific Reappraisal of the HIV-AIDS Hypothesis in 1991 published a letter in "Science" similar to the one they had attempted to publish in 1991. That same year, Continuum, a denialist group, placed an advertisement in the British gay and lesbian magazine "The Pink Paper" offering a £1,000 reward to "the first person finding one scientific paper establishing actual isolation of HIV", according to a set of seven steps they claimed to have been drawn up by the Pasteur Institute in 1973. The challenge was later dismissed by various scientists, including Duesberg, asserting that HIV undoubtedly exists. Stefan Lanka argued in the same year that HIV does not exist. Also that year, the National Institute of Allergy and Infectious Diseases released a report concluding that "abundant epidemiologic, virologic and immunologic data support the conclusion that infection with the human immunodeficiency virus (HIV) is the underlying cause of AIDS."