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Helling M, Venulet J. Drug recording and classification by the WHO research centre for international monitoring of adverse reactions to drugs. Methods Inf Med. 1974;13(3):169-78
Helling, M., & Venulet, J. (1974). Drug recording and classification by the WHO research centre for international monitoring of adverse reactions to drugs. Methods of information in medicine, 13(3), 169-78.
Helling, M, and Venulet, J. "Drug recording and classification by the WHO research centre for international monitoring of adverse reactions to drugs." Methods of information in medicine vol. 13,3 (1974): 169-78.
Helling M, Venulet J. Drug recording and classification by the WHO research centre for international monitoring of adverse reactions to drugs. Methods Inf Med. 1974 Jul;13(3):169-78. PMID: 4607443.
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