Natural language processing of referral letters improves machine learning-based triaging of patients with low back pain to the most appropriate intervention - Fudickar, Sebastian; Bantel, Carsten; Spieker, Jannik; Töpfer, Heinrich; Stegeman, Patrick; Schiphorst Preuper, Henrica R.; Reneman, Michiel F.; Wolff, André P.; Soer, Remko (Journal of Medical Internet Research, 2023)