全文获取类型
收费全文 | 150543篇 |
免费 | 32564篇 |
国内免费 | 2398篇 |
专业分类
耳鼻咽喉 | 5162篇 |
儿科学 | 5427篇 |
妇产科学 | 2394篇 |
基础医学 | 3192篇 |
口腔科学 | 1487篇 |
临床医学 | 26721篇 |
内科学 | 47543篇 |
皮肤病学 | 7441篇 |
神经病学 | 14728篇 |
特种医学 | 6415篇 |
外科学 | 41044篇 |
综合类 | 267篇 |
现状与发展 | 72篇 |
一般理论 | 1篇 |
预防医学 | 7201篇 |
眼科学 | 3480篇 |
药学 | 1144篇 |
中国医学 | 12篇 |
肿瘤学 | 11774篇 |
出版年
2024年 | 689篇 |
2023年 | 4798篇 |
2022年 | 1213篇 |
2021年 | 3144篇 |
2020年 | 6049篇 |
2019年 | 2202篇 |
2018年 | 7426篇 |
2017年 | 7346篇 |
2016年 | 8436篇 |
2015年 | 8422篇 |
2014年 | 15539篇 |
2013年 | 15703篇 |
2012年 | 5571篇 |
2011年 | 5546篇 |
2010年 | 10377篇 |
2009年 | 14257篇 |
2008年 | 5800篇 |
2007年 | 4009篇 |
2006年 | 6490篇 |
2005年 | 3762篇 |
2004年 | 3020篇 |
2003年 | 1984篇 |
2002年 | 2072篇 |
2001年 | 3814篇 |
2000年 | 3020篇 |
1999年 | 3216篇 |
1998年 | 3640篇 |
1997年 | 3459篇 |
1996年 | 3361篇 |
1995年 | 3205篇 |
1994年 | 1937篇 |
1993年 | 1564篇 |
1992年 | 1388篇 |
1991年 | 1430篇 |
1990年 | 1077篇 |
1989年 | 1192篇 |
1988年 | 1027篇 |
1987年 | 865篇 |
1986年 | 909篇 |
1985年 | 733篇 |
1984年 | 568篇 |
1983年 | 543篇 |
1982年 | 532篇 |
1981年 | 416篇 |
1980年 | 367篇 |
1979年 | 320篇 |
1978年 | 348篇 |
1977年 | 414篇 |
1975年 | 294篇 |
1972年 | 310篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
44.
Breast Elastography: How to Perform and Integrate Into a “Best-Practice” Patient Treatment Algorithm
Breast elastography has been available for more than 15 years but is not widely incorporated into clinical practice. Many publications report extremely high accuracy for various breast elastographic techniques. However, results in the literature are extremely variable. This variability is most likely due to variations in technique, a relatively steep learning curve, and variability in methods between vendors. This article describes our protocol for performing breast elastography using both strain elastography and shear wave elastography, which produces high sensitivity and specificity. Additionally, we will describe the most commonly known false-positive and false-negative lesions as well as how to detect them. 相似文献
45.
Fayiqa Ahamed Bahkir Srinivasan Subramanian Grandee 《Indian journal of ophthalmology》2020,68(11):2378
Purpose:Since the declaration of the lockdown due to COVID-19, the usage of digital devices has gone up across the globe, resulting in a challenge for the visual systems of all ages. The purpose of this study is to assess the impact of the lockdown on digital device usage, and consequently, the ocular surface health implications and circadian rhythm abnormalities related to digital eye strain.Methods:An open online survey was sent through various social media platforms and was open for a period of 2 weeks.Results:A total of 407 usable responses were obtained; the average age of respondents was 27.4 years. Typically, 93.6% of respondents reported an increase in their screen time since the lockdown was declared. The average increase in digital device usage was calculated at about 4.8 ± 2.8 h per day. The total usage per day was found to be 8.65 ± 3.74 hours. Sleep disturbances have been reported by 62.4% of people. Typically, 95.8% of respondents had experienced at least one symptom related to digital device usage, and 56.5% said that the frequency and intensity of these symptoms increased since the lockdown was declared.Conclusion:The study highlighted the drastic increase in use of digital devices after the initiation of the COVID-19 lockdown, and along with it, the slow deterioration of ocular health across all age groups. Awareness about prevention of digital eye strain should be stressed, and going forward, measures to bring these adverse effects to a minimum should be explored. 相似文献
46.
The term “oligometastatic prostate cancer” refers to a heterogeneous group of disease states currently defined solely on the basis of clinical features. Oligorecurrent disease, de novo oligometastases, and oligoprogressive disease likely have unique biologic underpinnings and natural histories. Evidence suggesting the existence of a subset of patients who harbor prostate cancer with limited metastatic potential currently includes disparate and overwhelmingly retrospective reports. Nevertheless, emerging prospective data have corroborated the “better-than-expected,” retrospectively observed outcomes, particularly in the setting of oligorecurrent prostate cancer. Improved functional imaging with prostate-specific membrane antigen-targeted strategies may enhance the identification of patients with oligometastatic prostate cancer in the short term. In the long term, refinement of the oligometastatic case definition likely will require biologic risk-stratification schemes. To determine optimal treatment strategies and identify patients most likely to benefit from metastasis-directed therapy, future efforts should focus on conducting high-quality, prospective trials with much-needed molecular correlative studies. 相似文献
47.
48.
49.