全文获取类型
收费全文 | 16372篇 |
免费 | 1108篇 |
国内免费 | 372篇 |
专业分类
耳鼻咽喉 | 86篇 |
儿科学 | 351篇 |
妇产科学 | 1369篇 |
基础医学 | 1001篇 |
口腔科学 | 432篇 |
临床医学 | 1899篇 |
内科学 | 3493篇 |
皮肤病学 | 174篇 |
神经病学 | 483篇 |
特种医学 | 397篇 |
外国民族医学 | 2篇 |
外科学 | 1511篇 |
综合类 | 2127篇 |
预防医学 | 1685篇 |
眼科学 | 81篇 |
药学 | 1642篇 |
30篇 | |
中国医学 | 553篇 |
肿瘤学 | 536篇 |
出版年
2024年 | 39篇 |
2023年 | 313篇 |
2022年 | 575篇 |
2021年 | 808篇 |
2020年 | 689篇 |
2019年 | 651篇 |
2018年 | 625篇 |
2017年 | 636篇 |
2016年 | 658篇 |
2015年 | 607篇 |
2014年 | 1178篇 |
2013年 | 1355篇 |
2012年 | 967篇 |
2011年 | 1058篇 |
2010年 | 818篇 |
2009年 | 813篇 |
2008年 | 704篇 |
2007年 | 712篇 |
2006年 | 626篇 |
2005年 | 597篇 |
2004年 | 478篇 |
2003年 | 346篇 |
2002年 | 320篇 |
2001年 | 248篇 |
2000年 | 215篇 |
1999年 | 165篇 |
1998年 | 146篇 |
1997年 | 138篇 |
1996年 | 124篇 |
1995年 | 136篇 |
1994年 | 100篇 |
1993年 | 87篇 |
1992年 | 85篇 |
1991年 | 76篇 |
1990年 | 66篇 |
1989年 | 68篇 |
1988年 | 59篇 |
1987年 | 44篇 |
1986年 | 41篇 |
1985年 | 67篇 |
1984年 | 74篇 |
1983年 | 50篇 |
1982年 | 49篇 |
1981年 | 45篇 |
1980年 | 35篇 |
1979年 | 26篇 |
1978年 | 35篇 |
1977年 | 28篇 |
1976年 | 25篇 |
1973年 | 15篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
《Digestive and liver disease》2022,54(11):1486-1493
BackgroundCold snare polypectomy (CSP) is a promising technique for the removal of sessile serrated polyps (SSPs) ≥ 10 mm. However, the efficacy and safety of this technique remain undetermined.AimsWe aimed to comprehensively evaluate the efficacy and safety of CSP for SSPs ≥ 10 mm.MethodsPubMed, EMBASE, Web of Science and Cochrane Library were searched up to January 2021.ResultsA total of 10 studies consisting of 1727 SSPs (range, 10–40 mm) from 1021 patients were included. The overall rates of technical success, adverse events (AEs) and residual SSPs were 100%, 0.7% and 2.9%, respectively. Subgroup analysis showed that the rates of technical success and AEs were comparable between CSP and cold endoscopic mucosal resection (EMR) (99.9% vs. 100% and 1.3% vs. 0.5%, respectively), between the proximal and distal colon (100% vs. 99.9% and 0.3% vs. 0, respectively), and between polyps of 10–19 mm and ≥20 mm (99.8% vs. 100% and 0.9% vs. 0, respectively). However, subgroup analysis showed that the rate of residual SSPs was slightly lower in CSP compared with cold EMR (1.3% vs. 3.9%), as well as in polyps of 10–19 mm compared with those ≥20 mm (3.1% vs. 4.7%).ConclusionCSP was an effective and safe technique for removing SSPs ≥ 10 mm. 相似文献
3.
《Revista brasileira de otorrinolaringologia (English ed.)》2022,88(4):602-606
IntroductionThe Modena bleeding score is a categorical rating scale that allows the assessment of the surgical field in relation to bleeding during endoscopic surgery. It has recently been presented and validated in the field of endoscopic ear surgery by the present authors. The Modena bleeding score provides five grades for rating the surgical field during endoscopic procedures (from grade 1 ? no bleeding to grade 5 ? bleeding that prevents every surgical procedure except those dedicated to bleeding control).ObjectiveThe aim of this study was to validate the Modena bleeding score in the setting of endoscopic sinus surgery.MethodsFifteen three-minute videos of endoscopic sinus surgery procedures (each containing three bleeding situations) were evaluated by 15 specialists, using the Modena bleeding score. Intra and inter-rater reliability were assessed, and the clinical validity of the Modena bleeding score was calculated using a referent standard.ResultsThe data analysis showed an intra-rater reliability ranging from 0.6336 to 0.861. The inter-rater reliability ranged from 0.676 to 0.844. The clinical validity was α = 0.70; confidence limits: 0.64 ? 0.75, corresponding to substantial agreement.ConclusionThe Modena bleeding score is an effective method to score bleeding during endoscopic sinus surgery. Its application in future research could facilitate the performance and efficacy assessment of surgical techniques, materials or devices aimed to bleeding control during endoscopic sinus surgery. 相似文献
4.
5.
6.
《Clinical gastroenterology and hepatology》2022,20(3):e380-e397
- Download : Download high-res image (232KB)
- Download : Download full-size image
7.
目的探讨乙肝孕妇血清标志物模式、HBV-DNA载量及肝功能三者之间的关系,为孕期乙肝病毒感染情况的监控和乙肝病毒母婴传播的预防提供参考。方法选取2019年1月-11月在我院产检的767例乙肝表面抗原阳性孕妇的乙肝血清标志物模式、肝功能指标的丙氨酸氨基转移酶(alamine aminotransferase,ALT)及HBVDNA载量进行研究,探讨三者间的关系。结果HBsAg、HBeAg、HBcAb阳性组孕妇HBV-DNA阳性率及病毒载量均高于其余两组(P<0.05);ALT升高程度与HBV-DNA载量具有一定相关性(r=0.255,χ^2=80.150,P=0.000);HBeAg阳性组和HBeAg阴性组间HBV-DNA阳性率、ALT异常率差异均有统计学意义。结论HBV-M、HBV-DNA与肝功能之间有一定的相关性,大三阳孕妇中高病毒载量比例高,应加强乙肝孕妇孕期各项指标的监测,必要时进行干预治疗。 相似文献
8.
9.
10.