- Effectiveness of feedback for improving case management of malaria, diarrhoea and pneumonia--a randomized controlled trial at provincial hospitals in Lao PDR. Wahlström, R., Kounnavong, S., Sisounthone, B., Phanyanouvong, A., Southammavong, T., Eriksson, B., Tomson, G. Trop. Med. Int. Health (2003)