Becker N, Fortuny J, Alvaro T, Nieters A, Maynadie M, Foretova L, Staines A, Brennan P, Boffetta P, Cocco PL, de Sanjose S. Medical history and risk of lymphoma: results of a European case-control study (EPILYMPH). J Cancer Res Clin Oncol. 2009 Aug;135(8):1099-107. doi: 10.1007/s00432-009-0551
Michels KB, Rothman KJ. Update on unethical use of placebos in randomised trials. Bioethics. 2003 Apr;17(2):188-204.
Whalley D, McKenna SP, de Jong Z, van der Heijde D. Quality of life in rheumatoid arthritis. Br J Rheumatol. 1997;36(8):884-8.
de Jong Z, van der Heijde D, McKenna SP, Whalley D. The reliability and construct validity of the RAQoL: a rheumatoid arthritis-specific quality of life instrument. Br J Rheumatol. 1997;36(8):878-83.