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Valdez LM, Gotuzzo E, Thielman NM, Dupont HL. Gastrointestinal Symptoms. 2006 Dec 1;2:1446–58.

Valdez, L. M., et al. Gastrointestinal Symptoms. Vol. 2, Dec. 2006, pp. 1446–58. Scopus, doi:10.1016/B978-0-443-06668-9.50128-9.

Valdez LM, Gotuzzo E, Thielman NM, Dupont HL. Gastrointestinal Symptoms. 2006 Dec 1;2:1446–1458.