 Primary objective: To describe and compare the safety and tolerability of infusion of fresh autologous bone marrow-derived Mesenchymal stromal cells after islet transplantation in chronic pancreatitis patients who undergo TP-IAT. The investigators plan to enroll 24 patients for the whole study. The duration of this study is 12 months. The investigators anticipate that this study will be completed within 2 years of commencement. 