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The endoscopic use of lasers in the treatment of gastrointestinal d seases began within the last decade and has evolved rapidly. Work is now being done at more than 150 centers in Europe, the United States, Japan and the rest of the world. To date no publi cation has defined the state of the art. This text attempts to fill that void. To disseminate information about therapeutic laser endoscopy, an increasing number of short courses have been sponsored in the United States wherein the attendee hears didactic lectures, views video tapes, and in addition, has the opportunity to have a "hands-on"...

This work presents the kinds of ethical dilemmas that typically occur in different studies of children, and then provides 65 real-world cases from experts who study children's mental health to offer practical advice for professionals and students in research methods.