8Manfredsdottir VF,Vikingsdottir T,Jonsson T,et al.The effects of tobacco smoking and rheumatoid factor sero-positivity on disease activity and joint damage in early rheumatoid arthritis[J].Rheumatology,2006,45:734-740.
9Alexiou I,Germenis A,Koutroumpas A,et al.Anti-cyclic citrullinated peptide(CCP)antibodies and extra articular manifestations in Greek patients with rheumatoid arthritis[J].Clin Rheumatol,2008,27:511-513.
10Nannini C,Ryu JH,Matteson EL.Lung disease in rheumatoid arthritis[J].Curr Opin Rheumatol,2008,20:340-346.
