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  2. National Digestive Diseases Information Clearinghouse (NDDIC). Ce qui cause la constipation. (en anglais)
  3. Lax-A-Day® Prescribing Information. Pendopharm, July 2011.
  4. Statistics Canada. Table 051-0005: estimates of population, Canada, provinces and territories quarterly (persons). View here:
  5. The Merck Manual for Healthcare Professionals. Gas-related complaints.