In medical papers, materials are the foundation for refining the article's theme and the pillar for expressing it. The value of materials directly influences the significance of the theme. Therefore, the collection and accumulation of materials have always been highly valued by scientific and technological workers. Materials are divided into direct materials and indirect materials. First, methods for collecting materials. Currently, there are three main methods for collecting materials:

First, the survey method. The characteristics of the survey method are: when gathering material for a predetermined research purpose, no intervention or artificial control is applied to the research (survey) subjects. The survey method is divided into the following four types:

1. Cross-sectional survey. Also known as a prevalence survey, it investigates the occurrence or existence of a certain condition in a current population, providing a cross-sectional understanding of a subject. Cross-sectional surveys are divided into comprehensive surveys (census) or non-comprehensive surveys (including typical surveys and sampling surveys).

2. Retrospective survey. As the name implies, it is conducted after an event has occurred, thus lacking prior design. It is often used to infer causes from outcomes, i.e., analyzing reasons through survey results.

3. Prospective survey. Opposite to retrospective surveys, it requires careful prior design and then collects data after a period of observation. Prospective surveys have strong scientific rigor, good comparability of data, and greater scientific value of results. They are often applied to infer outcomes from causes, with subjects divided into groups or control groups.

4. Follow-up survey. Depending on the research purpose, this type of survey can track subjects for several years, decades, or even longer. It is often used to assess the long-term efficacy of certain diseases.

Second, the observation method. This method is an improvement and discovery based on the survey method, making the observation results more accurate and scientific. First, the selection of observation subjects should be typical; generally, the more typical the subjects, the more reliable and persuasive the observation results. Second, the observation method should be objective; the stronger the objectivity, the greater the scientific value of the observation results. Upholding the objectivity of the observation method requires a strong sense of responsibility and a strict scientific attitude.

Third, the experimental method. This method involves understanding objective phenomena by altering or replicating research subjects under fully controlled artificial conditions. Experiments include in vitro tests, animal tests, human trials, and other methods. They are often used in basic research.

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