Highlighting the ethics of implementation research.

Luyckx VA Institute of Biomedical Ethics and the History of Medicine, University of Zurich, Zurich, Switzerland.
Reis A Global Health Ethics Team, World Health Organization, 1211 Geneva, Switzerland. Electronic address: reisa@who.int.
Maher D Special Programme for Research and Training in Tropical Diseases, WHO, Geneva, Switzerland.
Vahedi M Special Programme for Research and Training in Tropical Diseases, WHO, Geneva, Switzerland.