1. Assessment of the extent of unpublished studies in prognostic factor research: a systematic review of p53 immunohistochemistry in bladder cancer as an example. Issue 8 (16th August 2016) Authors: Sekula, Peggy; Pressler, Julia B; Sauerbrei, Willi; Goebell, Peter J; Schmitz-Dräger, Bernd J Journal: BMJ open Issue: Volume 6:Issue 8(2016) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗