Luyckx 1998.

Methods	Non‐randomised study. Type of study: retrospective and prospective cohort. Inclusion criteria: severely obese patients submitted to a vertical ring gastroplasty or adjustable gastric banding. Exclusion criteria: insufficiently motivated patients, alcohol abusers (> 20 glasses/week) or drug addicts.
Participants	Sample size: 69 obese patients. Characteristics of included patients: 10 males and 59 females, aged 36 ± 11 years, BMI 43.9 ± 8.3 kg/m2.
Interventions	Vertical ring gastroplasty or an adjustable gastric banding and second liver biopsy due to non‐liver related surgery.
Outcomes	Histology Normal histology 13 vs 45 % (P < 0.001), steatosis 83 vs 38% (P < 0.001), steatohepatitis 14 vs 25% (P < 0.05), fibrosis 1.5 vs 1.5%, first vs second liver biopsy respectively.
Notes	Follow‐up: not declared