The profner shared task on automatic recognition of occupation mentions in social media: systems, evaluation, guidelines, embeddings and corpora - Miranda-Escalada, Antonio; Farré-Maduell, Eulàlia; Lima-López, Salvador; Gascó, Luis; Briva-Iglesias, Vicent; Agüero-Torales, Marvin; Krallinger, Martin (Proceedings of the Sixth Social Media Mining for Health (# SMM4H) Workshop and Shared Task, 2021)