Survey Finds Popularity of Hair Restoration Is Growing: Number of Procedures Performed Worldwide Increased 34% Since 2004 July 2007 in “ Hair transplant forum international ” Robert C. F. Leonard, Karen Sideris We don't know much about this study yet. We're maintaining the world's largest resposity of hair loss research. You can help out the community by sending a PDF of this study here . Not sure how to get a study's PDF? You can email the authors of the study. View this study on ishrs-htforum.org →