Schäfer-Keller, P. (2008). Patient self-managment in kidney transplantation: definition, measurement, and intervention. PhD thesis, University of Basel (Faculty of Medicine and Faculty of Science), Basel, Switzerland. Magna cum laude.
Schäfer-Keller, P. (2004). A comparison of different methods of measuring medication adherence in patients after kidney transplantation. Master of Science in Nursing, University of Basel (Institute of Nursing Science), Basel, Switzerland.