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van der Willigen AH, van der Hoek JC, Wagenvoort JH, van Vliet HJ, van Klingeren B, Schalla WO, Knapp JS, van Joost T, Michel MF, Stolz E.van der Willigen AH, et al. Among authors: schalla wo.Antimicrob Agents Chemother. 1987 Apr;31(4):535-8. doi: 10.1128/AAC.31.4.535.Antimicrob Agents Chemother. 1987.PMID: 3111354Free PMC article.Clinical Trial.