This is a "connection" page, showing publications co-authored by Xiang Zhou and Andrey Rzhetsky.
DiseaseConnect: a comprehensive web server for mechanism-based disease-disease connections. Nucleic Acids Res. 2014 Jul; 42(Web Server issue):W137-46.
The connection strength for concepts is the sum of the scores for each matching publication.
Publication scores are based on many factors, including how long ago they were written and whether the person is a first or senior author.