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Lalla U, Allwood BW, Sinha Roy S, Irusen EM, Koegelenberg CFN.Lalla U, et al. Among authors: allwood bw.Respiration. 2017;93(6):436-440. doi: 10.1159/000465526. Epub 2017 Mar 30.Respiration. 2017.PMID: 28355597Free article.
Koegelenberg CFN, Bennji SM, Boer E, Schubert PT, Shaw JA, Allwood BW, Irusen EM.Koegelenberg CFN, et al. Among authors: allwood bw.S Afr Med J. 2018 Mar 28;108(4):275-277. doi: 10.7196/SAMJ.2017.v108i4.12936.S Afr Med J. 2018.PMID: 29629675Free article.