Jejunoileal BypassHyperlipidemiasCholesterolObesityCholesterol, DietaryCholesterol, HDLCholesterol, LDLCholesterol EstersCholesterol OxidaseCholesterol 7-alpha-HydroxylaseObesity, MorbidLipidsObesity, AbdominalTriglyceridesCholesterol, VLDLBody Mass IndexLipoproteinsHypercholesterolemiaPediatric ObesityAnticholesteremic AgentsSterol O-AcyltransferaseLipoproteins, HDLSterolsDietary FatsHydroxymethylglutaryl CoA ReductasesLipid MetabolismLiverApolipoprotein A-IBile Acids and SaltsRisk FactorsBody Weight