The report also acknowledged Internet (indoor) prostitution as an expanding market, which is more difficult to study and verify than street prostitution, and which, in the last five years, has increased in Sweden, Norway, and Denmark; however, it stated, concurring with the NIKK report (above), that "the scale of this form of prostitution is more extensive in our neighbouring countries, and there is nothing to indicate that a greater increase in prostitution over the Internet has occurred in Sweden than in these comparable countries.