  The results of the seventh edition of the BioASQ challenge are presented in
this paper. The aim of the BioASQ challenge is the promotion of systems and
methodologies through the organization of a challenge on the tasks of
large-scale biomedical semantic indexing and question answering. In total, 30
teams with more than 100 systems participated in the challenge this year. As in
previous years, the best systems were able to outperform the strong baselines.
This suggests that state-of-the-art systems are continuously improving, pushing
the frontier of research.
