Bullfighting in Barcelona

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• 1.
• Substantial contributions to study conception and design, or acquisition of data, or analysis and interpretation of data;

• 2.
• Drafting the article or revising it critically for important intellectual content; and

• 3.
• Final approval of the version to be published.
• 4.
• Fourth International Congress on Peer Review in Biomedical Publication. Program and abstracts. <http://www.ama-assn.org/public/peer/prc_program2001.htm> Accessed Nov 2001.
• 5.
• International Committee of Medical Journal Editors. Uniform requirements for manuscripts submitted to biomedical journals. <www.icmje.org> Updated October 2001.