PD Dr. med. Dr. sc. nat. Michael Fiechter and Dr. med. Tobias Pötzel are the Joint Medical Directors for Spine Surgery at the Swiss Paraplegic Centre in Nottwil, Switzerland. While PD Dr. Dr. Fiechter is a board-certified Neurosurgeon and Dr. Pötzel is a board-certified Orthopaedic Surgeon, both are specialized in Spine Surgery with focus on deformity correction and revision surgery of the spine. Prof. Dr. chem. Marc Pfeifer is a full professor at the Institute of Life Sciences, School of Engineering, University of Applied Sciences and Arts Western Switzerland (HES-SO Valais-Wallis) in Sion, Switzerland. He is spezialised in bioanalysis, point-of-care diagnostics (POCT), and in-vitro diagnostics. PD Dr. Dr. Fiechter, 4th Dan, and Prof. Dr. Pfeifer, 7th Dan, have both been practicing Goju-Ryu Karate-Do for many years and are considered experts in this style of martial arts.