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Schilder AG, Van Manen JG, Zielhuis GA, Grievink EH, Peters SA, Van Den Broek P.Schilder AG, et al. Among authors: van den broek p, van manen jg.Clin Otolaryngol Allied Sci. 1993 Jun;18(3):234-41. doi: 10.1111/j.1365-2273.1993.tb00838.x.Clin Otolaryngol Allied Sci. 1993.PMID: 8365017Clinical Trial.