RT Journal Article SR Electronic T1 Cholesterol gallstones: from epidemiology to prevention JF Postgraduate Medical Journal JO Postgrad Med J FD The Fellowship of Postgraduate Medicine SP 221 OP 229 DO 10.1136/pmj.77.906.221 VO 77 IS 906 A1 M Acalovschi YR 2001 UL http://pmj.bmj.com/content/77/906/221.abstract AB