[Non-publication and negative studies. Their significance for opinion formation and research].
Menger
M D
MD
Institut für Klinisch-Experimentelle Chirurgie, Universität des Saarlandes 66421 Homburg/Saar. exmdme@med-rz.uni-sb.de
Vollmar
B
B
D006801:Humans; D010506:Periodicals as Topic / Q000592:standards*; D017594:Publication Bias; D012106:Research / Q000592:standards*