全文获取类型
收费全文 | 2772篇 |
免费 | 157篇 |
国内免费 | 21篇 |
专业分类
耳鼻咽喉 | 8篇 |
儿科学 | 78篇 |
妇产科学 | 146篇 |
基础医学 | 323篇 |
口腔科学 | 42篇 |
临床医学 | 217篇 |
内科学 | 565篇 |
皮肤病学 | 75篇 |
神经病学 | 92篇 |
特种医学 | 82篇 |
外国民族医学 | 3篇 |
外科学 | 408篇 |
综合类 | 47篇 |
预防医学 | 184篇 |
眼科学 | 33篇 |
药学 | 404篇 |
中国医学 | 24篇 |
肿瘤学 | 219篇 |
出版年
2024年 | 2篇 |
2023年 | 35篇 |
2022年 | 83篇 |
2021年 | 140篇 |
2020年 | 93篇 |
2019年 | 138篇 |
2018年 | 143篇 |
2017年 | 95篇 |
2016年 | 106篇 |
2015年 | 80篇 |
2014年 | 99篇 |
2013年 | 149篇 |
2012年 | 196篇 |
2011年 | 208篇 |
2010年 | 93篇 |
2009年 | 97篇 |
2008年 | 121篇 |
2007年 | 125篇 |
2006年 | 124篇 |
2005年 | 129篇 |
2004年 | 102篇 |
2003年 | 108篇 |
2002年 | 107篇 |
2001年 | 51篇 |
2000年 | 35篇 |
1999年 | 45篇 |
1998年 | 13篇 |
1997年 | 9篇 |
1996年 | 13篇 |
1995年 | 13篇 |
1994年 | 9篇 |
1993年 | 10篇 |
1992年 | 28篇 |
1991年 | 15篇 |
1990年 | 10篇 |
1989年 | 14篇 |
1988年 | 10篇 |
1987年 | 11篇 |
1986年 | 10篇 |
1985年 | 14篇 |
1984年 | 10篇 |
1983年 | 14篇 |
1982年 | 8篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1979年 | 7篇 |
1975年 | 7篇 |
1971年 | 3篇 |
1970年 | 2篇 |
1966年 | 2篇 |
排序方式: 共有2950条查询结果,搜索用时 15 毫秒
31.
32.
Waled Amen Mohammed Ahmed Sara Boutros Shokai Insaf Hassan Abduelkhair Amira Yahia Boshra 《AIMS Public Health》2015,2(4):655-666
This study aims to explore and examine the conjectures surrounding the utilization of family planning services among currently married couples of childbearing age in Renk County.This study has adopted a qualitative method to collect data on factors affecting the utilization of family planning services through focus group discussions and in-depth interviews, in rural and urban areas of Renk County. It targeted married women, men as well as unmarried men and women. The researchers conducted nine focus group discussions and nine interviews at both Jelhak (rural setting) and Renk (urban setting). The results suggested that the people of Renk County prefer to have large families and therefore choose not to use family planning methods. The data collected was analyzed by means of thematic analysis. This included the construction of a thematic framework, coding, editing and categorization of available data as well as the creation of sub-themes.The result also suggested that perception is a main factor that affects utilization of family planning services with a majority of the people in Renk and Jelhak preferring to have many children in order to increase the family size for some reasons. These are linked to religion, social stigma and taboo that are attached to childless people or users of family planning methods for birth control purposes.The responses revealed some variation in perception between rural (Jelhak) and urban (Renk) areas. Respondents from Renk area reported that some people use family planning services for economic reasons that involve alleviation of financial difficulties and provision of better education when the family size is small. On the other hand, rural people from Jelhak perceive family planning to be socially un-acceptable. Furthermore, men and women of Jelhak reported that after each birth of a child, married couples avoid sexual relationship for a period of two years as means of family planning. Women of both Urban and Rural settings reported intentions to use conventional methods of family planning without the knowledge of their spouses. 相似文献
33.
34.
35.
Manuel Valdebran Justin Bandino Amira Elbendary Abdallah Gad Krishna C. Arudra Sébastien de Feraudy Dirk M. Elston 《Journal of cutaneous pathology》2018,45(3):204-207
Background
Interpretation of Clark's nevi has generated debate over the years; although criteria have been proposed for grading morphological features of melanocytes, there is still confusion and variability in the assessment of these lesions.Methods
This is a retrospective observational study conducted on 100 Clark's nevi and 84 melanomas. A single expert dermatopathologist evaluated all blinded and randomized photomicrographs of both the Clark's nevi and melanomas for the presence of 14 cytologic features. Subsequently, a multivariate model was used to obtain sensitivity and specificity.Results
Clark's nevi showed a significantly higher frequency of absent‐or‐inconspicuous nucleoli over melanoma, whereas mitotic figures, pleomorphism, notching, multiple nucleoli, peppered moth nuclear pattern, flattened adjacent nuclei, prominent nucleoli and vesicular nucleus with rounded nucleoli were found significantly higher in frequency in melanomas.Conclusion
Our data suggest that nuclear alterations are of value in the differentiation of atypical nevi from melanoma. 相似文献36.
37.
38.
39.