Hogg, B., Coppens, E., Gatto, D. L., Córdoba-Gil, C. D., Mateos, J. L. A., Bakiu, K., Callanan, A., Pashoja, A. C., Conceição, V., Dandi, E., Faurholt-Jepsen, M., Katsoridou, C., Khan, A., Luyten, J., McGreevy, K. R., Mere, R., O’Shea, D., Papaioannou, G., Qirjako, G., Reich, H., Värnik, P., Värnik, A., Vivas, A. B., Arensman, E., Audenhove, C. V., Gusmão, R., Amann, B. L., Schnitzspahn, K., Hegerl, U. (2026). COMBINA: The EAAD four-level approach for depression and suicide prevention and wellbeing promotion in the community and vulnerable populations. A cross-country study protocol from the MENTBEST project. PLoS ONE. https://doi.org/10.1371/journal.pone.0352598