1. research objects and methods: medical papers usually focus on biological systems such as people, animals or cells, and adopt various medical research methods for experiments or observations.

2. Strict ethical requirements: Medical research involves human beings or animals, and it is necessary to follow ethical requirements to ensure that the research process and results are harmless to human beings, animals and the environment.

3. Data analysis and results presentation: Medical papers need to accurately present experimental results and data analysis, including pictures, tables and statistical analysis.

4. Literature review and discussion: Medical papers usually need to introduce the previous research progress in the literature review, and discuss the importance, potential limitations and future research direction of the research results.

Therefore, the characteristics of medical papers do not include some factors unrelated to medical research, such as cultural background, gender, religious beliefs, or the author's personal views and attitudes.