O’Keeffe, M., Skidmore, N., Bagnis, A., Bąbel, P., Bajcar, E. A., Palma, A. D., Evers, A. W., Glogan, E., Haas, J. W., Meeuwis, S. H., Oleszczyk, M., Portolés, A., Vlaeyen, J. W., Mattarozzi, K. (2026). Placebo and nocebo in clinical practice: An online cross-sectional survey of healthcare professionals from European countries on views, practices and training needs. PLoS ONE. https://doi.org/10.1371/journal.pone.0338905