Assenova, R., Le Reste, J., Foreva, G., Mileva, D., Czachowski, S., Sowinska, A., Nabbe, P., Argiriadou, S., Lazic, D., Hasaganic, M., Lingner, H., Lygidakis, H., Munoz, M., Claveria, A., Doerr, C., Van Marwijk, H., Van Royen, P., Lietard, C. Cross-cultural validation of the definition of multimorbidity in the Bulgarian llanguage,
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