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Kalies, Helen, Rieke Schöttmer, Steffen T. Simon, Raymond Voltz, Alexander Crispin, ja Claudia Bausewein. "Critical Attitudes and Beliefs Towards Guidelines Amongst Palliative Care Professionals – Results From a National Survey." BMC Palliat Care 2017.

Kalies, Helen, et al. "Critical Attitudes and Beliefs Towards Guidelines Amongst Palliative Care Professionals – Results From a National Survey." BMC Palliat Care 2017.