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Monteiro, E., Fernandes, J.P., Vieira, M.R., Correia, J.P., Caetano, J.M., Ribeiro, T., Antunes, A.B., Noronha, R., Batista, F., Reis, L., Mendes, M.P., Cabrita, A., Roseta, A., Abecassis, L., Pecegueiro, A., Rosa, S., Ferreira, S.B. and Fernandes, D. 1981. Double blind clinical trial on the use of ultra-levure in the prophylaxis of antibiotic induced gastro-intestinal and mucocutaneous disorders. Acta Médica Portuguesa. 3, 2 (Apr. 1981), 143–145. DOI:https://doi.org/10.20344/amp.3879.