Abstracts are required for all papers and posters. They can contain up to 300 words (no figures allowed) and must be written in English. The main authors of accepted contributions will be notified by 9 October 2019 (10 November 2019 for late posters). Oral presentations will be selected on the basis of the abstracts. Oral presentations are planned for 20 minutes including 5 min. questions. The maximal poster size is 84 cm wide and 118 cm tall. This is a standard AO portrait size.