Silvia Monteagudo1, Rik J Lories2,3. 1. Laboratory of Tissue Homeostasis and Disease, Skeletal Biology and Engineering Research Center, Department of Development and Regeneration, KU Leuven, Leuven, Belgium. 2. Laboratory of Tissue Homeostasis and Disease, Skeletal Biology and Engineering Research Center, Department of Development and Regeneration, KU Leuven, Leuven, Belgium. Rik.Lories@kuleuven.be. 3. Division of Rheumatology, UZ Leuven, Leuven, Belgium. Rik.Lories@kuleuven.be.