1 Department of Surgery, Li Ka Shing Faculty of Medicine, Dr. Li Dak-Sum Research Centre, The University of Hong Kong, Karolinska Institutet Collaboration in Regenerative Medicine, The University of Hong Kong, Hong Kong; Department of Cell and Molecular Biology, Karolinska Institute, Stockholm, Sweden; Department of Biosciences and Nutrition, Karolinska Institute, Huddinge, Sweden. Electronic address: paultam@hku.hk.
2 Department of Surgery, Li Ka Shing Faculty of Medicine, Dr. Li Dak-Sum Research Centre, The University of Hong Kong, Karolinska Institutet Collaboration in Regenerative Medicine, The University of Hong Kong, Hong Kong.
3 Department of Cell and Molecular Biology, Karolinska Institute, Stockholm, Sweden.
4 Department of Cell and Molecular Biology, Karolinska Institute, Stockholm, Sweden; Department of Biosciences and Nutrition, Karolinska Institute, Huddinge, Sweden. Electronic address: Emma.Andersson@ki.se.