Prostitution of children usually occurs in environments such as brothels, bars and clubs, homes, or particular streets and areas (usually in socially run down places). According to one study, only about 10% of prostituted children have a pimp and over 45% entered the business through friends. Maureen Jaffe and Sonia Rosen from the International Child Labor Study Office write that cases vary widely: "Some victims are runaways from home or State institutions, others are sold by their parents or forced or tricked into prostitution, and others are street children. Some are amateurs and others professionals. Although one tends to think first and foremost of young girls in the trade, there is an increase in the number of young boys involved in prostitution. The most disquieting cases are those children who are forced into the trade and then incarcerated. These children run the possible further risk of torture and subsequent death."