A population-based case-control study of HLA polymorphisms in Italian patients with primary biliary cirrhosis: Pietro Invernizzi, Div Int Med, Univ of Milan, Milan Italy; Francesca Poli, Transplant Immunol IRCCS, Osp Maggiore Policlinico, Milan Italy; Francesca Perego, Pier Maria Battezzati, Andrea Crosignani, Div Int Med, Univ of Milan, Milan Italy; Mario Scalamogna, Transplant Immunol IRCCS, Osp Maggiore Policlinico, Milan Italy; Anna Gritti, Div Int Med, Univ of Milan, Milan Italy; Alejandro Espadas de Arias, Transplant Immunol IRCCS, Osp Maggiore Policlinico, Milan Italy; Mauro Podda, Div Int Med, Univ of Milan, Milan Italy