Dagmar Hertel

Transdermal fentanyl in the long-term treatment of cancer pain: a prospective study of 50 patients with advanced cancer of the gastrointestinal tract or the head and neck region

L. Radbruch, S. Grond, K. Lehmann, 1997, Pain.

Validation of World Health Organization Guidelines for cancer pain relief: a 10-year prospective study

John Lynch, S. Grond, Stefan Grond, 1995, Pain.