The full-text of the following studies were considered for inclusion, but failed to meet the particular inclusion criteria for this report.

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27. Fidelholtz J, Smith W, Rawls J, Shi Y, Zack A, Rüegg P, et al. Safety and tolerability of tegaserod in patients with irritable bowel syndrome and diarrhea symptoms. The American journal of gastroenterology. 2002;97(5):1176–81.
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32. Gremse DA, Hixon J, Crutchfield A. Comparison of polyethylene glycol 3350 and lactulose for treatment of chronic constipation in children. Clin Pediatr (Phila) 2002;41(4):225–9.
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50. Kot TV, Pettit-Young NA. Lactulose in the management of constipation: a current review. Ann Pharmacother 1992;26(10):1277–82.
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53. Lewis G, Rudolph CD. Practical approach to defecation disorders in children. Pediatr Ann 1997;26(4):260–8.
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55. Loening-Baucke V. Constipation in children. N Engl J Med 1998;339(16):1155–6.
56. Loening-Baucke V. Polyethylene glycol without electrolytes for children with constipation and encopresis. J Pediatr Gastroenterol Nutr 2002;34(4):372–7.
57. Loening-Baucke V, Pashankar DS. A randomized, prospective, comparison study of polyethylene glycol 3350 without electrolytes and milk of magnesia for children with constipation and fecal incontinence. Pediatrics 2006;118(2):528–35.
58. Mack DJ, Erwin L, Fulton JD. Chronic constipation in elderly patients. Bmj 1993;307(6916):1425–6.
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