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这篇综述所引用的资料多为一九六五年以前的文献。当时的一些观察研究结果,仅反映了当时特定情况下的采些规律,不一定全部适用于当前的客观实际。刊登这篇综述的目的,希望引起各地对此问题作进一步研究和讨论。
Most of the information cited in this review is before 1965. Some observational studies at that time only reflected the laws adopted in the specific circumstances at that time and did not necessarily all apply to the current objective reality. The purpose of publishing this review is to raise the issue of further research and discussion in all parts of the country.