Upper gastrointestinal bleeding due to peptic ulcer disease is not associated with air pollution: a case-crossover study
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D. Tanyingoh | G. Kaplan | P. Villeneuve | D. Stieb | E. Lang | Subrata Ghosh | Markey Johnson | K. Madsen | R. Hilsden | S. V. van Zanten | K. Novak | Hong Yang | Samuel Quan