Csendes 2006.

Methods	Non‐randomised study. Type of study: prospective cohort. Inclusion criteria: all patients submitted to Roux‐en‐Y gastric bypass with resection of the bypassed stomach due to morbid obesity. Exclusion criteria: not given.
Participants	Sample size: 16 obese patients. Characteristics of included patients: mean age 46.2 years, 15 males, BMI 44.3 kg/m2.
Interventions	Roux‐en‐Y gastric bypass with resection of the bypassed stomach and second liver biopsy due to non‐liver related surgery.
Outcomes	Histology Normalization of liver histology 10 patients (66.7%). Decrease in liver histology 2 patients (13.3%). Worsening in liver histology 1 patient (6.7%). Without change 1 patient (6.7%).
Notes	Follow‐up: 22 months.