Follistatin-like 1 promotes proliferation of matured human hypoxic iPSC-cardiomyocytes and is secreted by cardiac fibroblasts oleh Marijn C. Peters, Sofia Di Martino, Thomas Boelens, Jiabin Qin, Alain van Mil, Pieter A. Doevendans, Steven A.J. Chamuleau, Joost P.G. Sluijter, Klaus Neef