全文获取类型
收费全文 | 185570篇 |
免费 | 34105篇 |
国内免费 | 2668篇 |
专业分类
耳鼻咽喉 | 5423篇 |
儿科学 | 5987篇 |
妇产科学 | 2775篇 |
基础医学 | 8010篇 |
口腔科学 | 2501篇 |
临床医学 | 28678篇 |
内科学 | 56190篇 |
皮肤病学 | 8313篇 |
神经病学 | 17205篇 |
特种医学 | 7633篇 |
外科学 | 47188篇 |
综合类 | 378篇 |
现状与发展 | 72篇 |
一般理论 | 2篇 |
预防医学 | 7975篇 |
眼科学 | 4072篇 |
药学 | 3115篇 |
中国医学 | 146篇 |
肿瘤学 | 16680篇 |
出版年
2024年 | 524篇 |
2023年 | 4941篇 |
2022年 | 1582篇 |
2021年 | 3920篇 |
2020年 | 6435篇 |
2019年 | 2777篇 |
2018年 | 8177篇 |
2017年 | 7940篇 |
2016年 | 9131篇 |
2015年 | 9166篇 |
2014年 | 16482篇 |
2013年 | 16904篇 |
2012年 | 7615篇 |
2011年 | 8024篇 |
2010年 | 11751篇 |
2009年 | 15347篇 |
2008年 | 7979篇 |
2007年 | 6444篇 |
2006年 | 8730篇 |
2005年 | 6217篇 |
2004年 | 5409篇 |
2003年 | 4405篇 |
2002年 | 4520篇 |
2001年 | 4220篇 |
2000年 | 3432篇 |
1999年 | 3772篇 |
1998年 | 4228篇 |
1997年 | 3933篇 |
1996年 | 3810篇 |
1995年 | 3580篇 |
1994年 | 2285篇 |
1993年 | 1871篇 |
1992年 | 1663篇 |
1991年 | 1675篇 |
1990年 | 1303篇 |
1989年 | 1412篇 |
1988年 | 1220篇 |
1987年 | 1036篇 |
1986年 | 1059篇 |
1985年 | 885篇 |
1984年 | 710篇 |
1983年 | 646篇 |
1982年 | 601篇 |
1981年 | 503篇 |
1980年 | 455篇 |
1979年 | 390篇 |
1978年 | 385篇 |
1977年 | 444篇 |
1975年 | 304篇 |
1972年 | 312篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
Yolanda Carrascal PhD Gregorio Laguna PhD Miriam Blanco MD Bárbara Segura MD Iciar Martínez-Almeida MD 《Journal of cardiac surgery》2020,35(2):457-459
Gray platelet syndrome (GPS) is a rare (<1/1 000 000) and inherited platelet function disorder characterized by macrothrombocytopenia, α-granule deficiency, and hemorrhages. Bleeding intensity does not correlate with platelet count nor with functional test results. We hereby describe the perioperative bleeding prevention and management of a patient with GPS requiring multiple redo cardiac surgeries. 相似文献
64.
Heterozygous nonsense mutations near the C‐terminal region of IGF1R in two patients with small‐for‐gestational‐age‐related short stature
下载免费PDF全文
![点击此处可从《Clinical endocrinology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
65.
Femoral access‐related complications during percutaneous transcatheter aortic valve implantation comparing single versus double Prostar XL device closure
下载免费PDF全文
![点击此处可从《Catheterization and cardiovascular interventions》网站下载免费的PDF全文](/ch/ext_images/free.gif)
66.
Elizabeth A. Mosley PhD MPH Amy J. Schulz PhD MPH MSW Lisa H. Harris MD PhD Barbara A. Anderson PhD 《Women & health》2020,60(7):806-820
ABSTRACT Abortion is legal in South Africa, but negative abortion attitudes remain common and are poorly understood. We used nationally representative South African Social Attitudes Survey data to analyze abortion attitudes in the case of fetal anomaly and in the case of poverty from 2007 to 2016 (n = 20,711; ages = 16+). We measured correlations between abortion attitudes and these important predictors: religiosity, attitudes about premarital sex, attitudes about preferential hiring and promotion of women, and attitudes toward family gender roles. Abortion acceptability for poverty increased over time (b = 0.05, p < .001), but not for fetal anomaly (b = ?0.008, p = .284). Highly religious South Africans reported lower abortion acceptability in both cases (Odds Ratio (OR)anomaly = 0.85, p = .015; ORpoverty = 0.84, p = .02). Premarital sex acceptability strongly and positively predicted abortion acceptability (ORanomaly = 2.63, p < .001; ORpoverty = 2.46, p < .001). Attitudes about preferential hiring and promotion of women were not associated with abortion attitudes, but favorable attitudes about working mothers were positively associated with abortion acceptability for fetal anomaly ((ORanomaly = 1.09, p = .01; ORpoverty = 1.02, p = .641)). Results suggest negative abortion attitudes remain common in South Africa and are closely tied to religiosity, traditional ideologies about sexuality, and gender role expectations about motherhood. 相似文献
67.
68.
69.
Takashi Murakami Naoto Sakamoto Akihito Nagahara 《Journal of gastroenterology and hepatology》2019,34(10):1685-1695
Sessile serrated adenoma/polyps (SSA/Ps) are early precursor lesions in the serrated neoplasia pathway, which results in BRAF‐mutated colorectal carcinomas with not only high levels of microsatellite instability but also microsatellite stable. SSA/Ps with advanced histology, including cytological dysplasia or minimally invasive carcinomas, are important lesions because SSA/Ps are considered major contributors to “interval cancers” and these lesions can rapidly become dysplastic or invasive carcinomas. Clinicopathologically, SSA/Ps with dysplasia or invasive carcinoma were associated with advanced age, female sex, and proximal colon. Although SSA/Ps with submucosal invasive carcinoma were smaller and invaded less deeply into the submucosal layer than conventional tubular adenomas with submucosal invasive carcinoma, SSA/Ps with submucosal invasive carcinoma frequently had a mucinous component and exhibited a higher potential for lymphatic invasion and lymph node metastasis. In an SSA/P series, endoscopic characteristics, including (semi)pedunculated morphology, double elevation, central depression, and reddishness, may help accurately diagnose SSA/Ps with advanced histology. Removal of SSA/Ps with dysplasia or invasive carcinoma was recommended. Endoscopic treatment such as endoscopic mucosal resection or endoscopic submucosal dissection is useful for those lesions. However, surgical resection with lymph node dissection might be indicated when SSA/Ps with invasive carcinoma are endoscopically suspected, because these have the high risk of lymph node metastasis. Greater awareness may promote further research into improving the detection, recognition, and complete resection rates of SSA/Ps with dysplasia or invasive carcinoma and reduce the interval cancer rates. 相似文献