全文获取类型
收费全文 | 19582篇 |
免费 | 2103篇 |
国内免费 | 17篇 |
专业分类
耳鼻咽喉 | 154篇 |
儿科学 | 669篇 |
妇产科学 | 677篇 |
基础医学 | 2767篇 |
口腔科学 | 363篇 |
临床医学 | 2316篇 |
内科学 | 3957篇 |
皮肤病学 | 201篇 |
神经病学 | 1520篇 |
特种医学 | 532篇 |
外科学 | 2719篇 |
综合类 | 569篇 |
一般理论 | 44篇 |
预防医学 | 2464篇 |
眼科学 | 325篇 |
药学 | 1448篇 |
中国医学 | 24篇 |
肿瘤学 | 953篇 |
出版年
2023年 | 125篇 |
2021年 | 409篇 |
2020年 | 244篇 |
2019年 | 361篇 |
2018年 | 398篇 |
2017年 | 313篇 |
2016年 | 293篇 |
2015年 | 320篇 |
2014年 | 472篇 |
2013年 | 671篇 |
2012年 | 954篇 |
2011年 | 1041篇 |
2010年 | 531篇 |
2009年 | 509篇 |
2008年 | 808篇 |
2007年 | 857篇 |
2006年 | 798篇 |
2005年 | 837篇 |
2004年 | 756篇 |
2003年 | 726篇 |
2002年 | 689篇 |
2001年 | 602篇 |
2000年 | 633篇 |
1999年 | 544篇 |
1998年 | 248篇 |
1997年 | 208篇 |
1996年 | 224篇 |
1995年 | 199篇 |
1994年 | 164篇 |
1993年 | 159篇 |
1992年 | 434篇 |
1991年 | 476篇 |
1990年 | 442篇 |
1989年 | 406篇 |
1988年 | 352篇 |
1987年 | 381篇 |
1986年 | 350篇 |
1985年 | 337篇 |
1984年 | 281篇 |
1983年 | 238篇 |
1982年 | 151篇 |
1981年 | 143篇 |
1979年 | 192篇 |
1978年 | 144篇 |
1977年 | 149篇 |
1976年 | 123篇 |
1974年 | 182篇 |
1973年 | 163篇 |
1972年 | 131篇 |
1970年 | 133篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
In both adults and children with diabetes, technologies such as continuous subcutaneous insulin infusion using insulin pumps and continuous glucose monitoring can help improve diabetes control, reduce hypoglycaemia and improve quality of life. Access to these technologies in the UK is very variable. Some technologies are recommended by the National Institute for Health and Care Excellence, while others have not been appraised, and new technologies are emerging all the time. Additionally, different guidelines for adults and children further complicate access to diabetes technology in the transition from paediatric to adult care. Against this background, Diabetes UK and NHS England have brought together a multidisciplinary group of experts, including clinicians and people with diabetes, to develop this consensus guideline, combining the different technologies into a common pathway to aid clinical and policy decision‐making. We created a pathway that supports the incremental addition of technology as monotherapy and then dual therapy in the same way that we incrementally add in therapeutic agents to support people with Type 2 diabetes to achieve their personalized glycaemic targets. The pathway emphasizes the importance of structured education, specialist support and appropriate access to psychological therapies, as essential pillars for optimized use of diabetes‐related technology, and recommends the re‐evaluation of its use when the individual is unable either to use the technology appropriately or to achieve the intended outcomes. This pathway is endorsed by UK‐wide clinical and patient associations and we recommend that providers and commissioners use it to ensure the right individual with diabetes has access to the right technology in a timely way to help achieve better outcomes. 相似文献
6.
Sarah E. Henderson Shana A. Hall Jessica M. Callegari James A. Desjardins Sidney J. Segalowitz Karen L. Campbell 《Psychophysiology》2022,59(1):e13947
Recent work suggests that while voluntary episodic memory declines with age, involuntary episodic memory, which comes to mind spontaneously without intention, remains relatively intact. However, the neurophysiology underlying these differences has yet to be established. The current study used electroencephalography (EEG) to investigate voluntary and involuntary retrieval in older and younger adults. Participants first encoded sounds, half of which were paired with pictures, the other half unpaired. EEG was then recorded as they listened to the sounds, with participants in the involuntary group performing a sound localization cover task, and those in the voluntary group additionally attempting to recall the associated pictures. Participants later reported which sounds brought the paired picture to mind during the localization task. Reaction times on the localization task were slower for voluntary than involuntary retrieval and for paired than unpaired sounds, possibly reflecting increased attentional demands of voluntary retrieval and interference from reactivation of the associated pictures respectively. For the EEG analyses, young adults showed greater alpha event-related desynchronization (ERD) during voluntary than involuntary retrieval at frontal and occipital sites, while older adults showed pronounced alpha ERD regardless of intention. Additionally, older adults showed greater ERD for paired than unpaired sounds at occipital sites, likely reflecting visual reactivation of the associated pictures. Young adults did not show this alpha ERD memory effect. Taken together, these data suggest that involuntary memory is largely preserved with age, but this may be due to older adults' greater recruitment of top-down control even when demand for such control is limited. 相似文献
7.
Fluid role boundaries: exploring the contribution of the advanced nurse practitioner to multi‐professional palliative care
下载免费PDF全文
![点击此处可从《Journal of clinical nursing》网站下载免费的PDF全文](/ch/ext_images/free.gif)
8.
9.
Maggie L. Westfal David C. Chang Cassandra M. Kelleher 《Journal of pediatric surgery》2019,54(1):140-144
Purpose
The purpose of this study was to evaluate trends in demographics and outcomes of pediatric breast cancer in a United States population-based cohort.Methods
The Surveillance, Epidemiology, and End Results (SEER) database was utilized to identify all pediatric patients with malignant breast tumors between 1973 and 2014. Analysis was performed using Stata Statistical Software version 13.1. Associations between categorical variables were made using X2 test. Log-rank test was used for univariate survival analysis. Kaplan–Meier analysis investigated five-year survival rates across several variables. Adjusted analysis was performed using a Cox Proportional-Hazards regression.Results
134 patients with breast malignancies were identified. Carcinoma was the most prevalent histology (48.5%), followed by fibroepithelial tumors (FETs) (35.1%), and sarcoma (14.2%). FETs were twice as common in black compared to nonblack patients (56.3% vs. 29.0%, p?<?0.01). Analyzing histology by stage revealed that 100% of FETs were early stage disease (p?<?0.0001). 46.7% of the tumors tested were ER/PR negative, more than twice as many compared to the published adult estimate of 20.0%. Unadjusted survival analysis revealed worse survival for patients with adenocarcinoma/sarcomas, advanced stage, and high grade disease, without a survival difference between races.Conclusion
Breast cancer remains a rare malignancy among pediatric patients. Although black patients were found to have more noncarcinomatous tumors with less advanced disease, this did not confer a survival advantage.Type of study
Retrospective cohort study.Level of evidence
Level III. 相似文献10.
M. J. Englesbe S. J. Pelletier S. Kheterpal M. O'Reilly D. A. Campbell Jr. 《American journal of transplantation》2006,6(4):666-670
The severity of illness in transplant patients and the complexity of transplant operations results in significant postoperative morbidity and mortality. Remarkable efforts have been made by transplant physicians to study and improve organ allocation, graft and patient survival, immunosuppression and the long-term management of post-transplant complications. Less effort has been spent studying the actual transplant operation and systems of acute transplant care. The National Surgical Quality Improvement Program (NSQIP) has provided a standardized approach to quality improvement and has demonstrated significant potential for a reduction in postoperative morbidity and mortality in other surgical disciplines. Medical centers are under increasing pressure to measure surgical quality and the nexus of transplant surgical quality improvement should not lie in the hands of CMS or JACHO, but rather it should be created and developed within the transplant community. The time has come for a national transplant surgical quality improvement program based on the NSQIP infrastructure. Such a proactive approach toward quality improvement from the transplant community is an excellent investment for patients, providers and health care payers. 相似文献