Controversies: Do Doctors Need to Re-Certify? September 2013 in “ Hair transplant forum international ” Russell Knudsen TLDR Doctors should not have to re-certify. 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 →