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Williams, P E., Y A. Alwazir, M. Littley, D C. Buss, R. John, I A. Campbell, P A. Routledge, och J H. Lazarus. Determinants of Free Theophylline Clearance in Asthma. 1987.

Williams, P E., et al. Determinants of Free Theophylline Clearance in Asthma. 1987.