Berthold Rzany Berthold Rzany is a dermatologist and clinical epidemiologist in private practice (RZANY & HUND) in Berlin, Germany. Between 2002 and 2011 he held the position of C3-Professor of Evidence-Based Medicine in Dermatology at the Department of Dermatology and Venerology at the Charité Universitätsmedizin. Dr. Rzany studied Medicine in Freiburg, Germany, Vienna, Austria, and Harvard Medical School, Boston, USA. He received his dermatological education at the Department of Dermatology at the University of Freiburg, Germany, and worked as a Consultant in Dermatology in Mannheim, Fakultät für Klinische Medizin, University of Heidelberg. He has a special interest in aesthetic medicine and tries to incorporate evidence-based medicine in aesthetic medicine. Dr. Rzany is the author of several leading publications in this field. He likes teaching and frequently gives hands-on workshops on botulinum toxin A and injectable fillers. He is also a consultant for various companies in respect of these substances.     Mauricio de Maio Mauricio de Maio is a board-certified plastic surgeon from the Brazilian Society of Plastic Surgery and a member of the International Society of Aesthetic Plastic Surgery. Dr. de Maio graduated in Medicine from the Medical School of the University of Sao Paulo in 1990.  He specialized in Plastic Surgery in Brazil in 1996.  He obtained his Master’s Degree in Medicine in 1997 and Doctorate in Sciences in 2006 at the University of Sao Paulo, Brazil. He was a Clinical Assistant Professor in the Plastic Surgery Department of the University of Sao Paulo from 1996 to 2002. Dr. de Maio has authored scientific publications and articles, as well as published several books, including the following, co-authored with B. Rzany and published by Springer-Verlag:  Fillers in Aesthetic Medicine (2006), Botulinum Toxin in Aesthetic Medicine (2007), and The Male Patient in Aesthetic Medicine (2009). He is actively involved in research and teaches on international training courses in the United States, Europe, and Asia-Pacific.