PID-ARI.net – A Pediatric Infectious Diseases Network on Acute Respiratory Infections and the Added Value of a Multilevel Research Network - Weigl, J. A. I.; Puppe, W.; Meyer, C. U.; Berner, R.; Forster, J.; Schmitt, H. J.; Zepp, F. (Klinische Pädiatrie, 2008)