Reanalysis of Blanc PD et al, "Use of herbal products, coffee or black tea, and over-the-counter medications as self treatments among adults with asthma".

Blanc PD, Kuschner WG, Katz PP, Yelin EH. Reanalysis of Blanc PD et al, "Use of herbal products, coffee or black tea, and over-the-counter medications as self treatments among adults with asthma". J Allergy Clin Immunol. 2000 Jul; 106(1 Pt 1):196.