| Supplementary evidence: | ||
| Survey of laxative use by adults with self-defined constipation in South America and Asia: a comparison of six countries. Wald A, Mueller-Lissner S, Kamm MA, Hinkel U, Richter E, Schuijt C, Mandel KG, Aliment Pharmacol Ther. 2010 Jan 15;31(2):274-84 |
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