Efficacy of Chondroprotective Food Supplements Based on Collagen Hydrolysate and Compounds Isolated from Marine Organisms oleh Thomas Eckert, Mahena Jährling-Butkus, Helen Louton, Monika Burg-Roderfeld, Ruiyan Zhang, Ning Zhang, Karsten Hesse, Athanasios K. Petridis, Tibor Kožár, Jürgen Steinmeyer, Roland Schauer, Peter Engelhard, Anna Kozarova, John W. Hudson, Hans-Christian Siebert