全文获取类型
收费全文 | 4565篇 |
免费 | 607篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 69篇 |
儿科学 | 122篇 |
妇产科学 | 101篇 |
基础医学 | 614篇 |
口腔科学 | 173篇 |
临床医学 | 420篇 |
内科学 | 1012篇 |
皮肤病学 | 164篇 |
神经病学 | 328篇 |
特种医学 | 147篇 |
外科学 | 681篇 |
综合类 | 139篇 |
一般理论 | 13篇 |
预防医学 | 590篇 |
眼科学 | 67篇 |
药学 | 323篇 |
中国医学 | 1篇 |
肿瘤学 | 212篇 |
出版年
2020年 | 39篇 |
2019年 | 46篇 |
2018年 | 58篇 |
2017年 | 51篇 |
2016年 | 42篇 |
2015年 | 70篇 |
2014年 | 95篇 |
2013年 | 100篇 |
2012年 | 193篇 |
2011年 | 201篇 |
2010年 | 126篇 |
2009年 | 79篇 |
2008年 | 179篇 |
2007年 | 211篇 |
2006年 | 174篇 |
2005年 | 174篇 |
2004年 | 204篇 |
2003年 | 189篇 |
2002年 | 207篇 |
2001年 | 150篇 |
2000年 | 154篇 |
1999年 | 142篇 |
1998年 | 78篇 |
1997年 | 51篇 |
1996年 | 41篇 |
1995年 | 45篇 |
1994年 | 52篇 |
1992年 | 116篇 |
1991年 | 123篇 |
1990年 | 113篇 |
1989年 | 133篇 |
1988年 | 111篇 |
1987年 | 132篇 |
1986年 | 93篇 |
1985年 | 96篇 |
1984年 | 88篇 |
1983年 | 66篇 |
1982年 | 56篇 |
1981年 | 49篇 |
1980年 | 48篇 |
1979年 | 63篇 |
1978年 | 62篇 |
1977年 | 39篇 |
1976年 | 39篇 |
1975年 | 52篇 |
1974年 | 54篇 |
1973年 | 48篇 |
1972年 | 44篇 |
1971年 | 45篇 |
1970年 | 44篇 |
排序方式: 共有5176条查询结果,搜索用时 46 毫秒
1.
Two-year results after combined phacoemulsification and iris-fixated phakic intraocular lens removal
Gaurisankar Zoraida Solaiga van Rijn Gwyneth A. Cheng Yanny Y. Y. Luyten Gregorius P. M. Beenakker Jan-Willem M. 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》2022,260(4):1367-1375
Graefe's Archive for Clinical and Experimental Ophthalmology - To describe and present results after a technique for cataract surgery combined with explantation of an iris-fixated phakic... 相似文献
2.
K. A. Rees L. J. O'Halloran J. B. Wawryk R. Gotmaker E. K. Cameron H. D. J. Woonton 《Anaesthesia》2019,74(9):1153-1157
Emergency front-of-neck access to achieve a percutaneous airway can be a life-saving intervention, but there is debate about the preferred technique. This prospective, observational study was designed to compare the two most common emergency surgical airway techniques in a wet lab simulation using an ovine model. Forty-three doctors participated. After providing standardised reading, a lecture and dry lab benchtop training, participants progressed to a high-fidelity wet lab simulation. Participants entered an operating theatre where a ‘cannot intubate, cannot oxygenate’ situation had been declared and were directed to perform emergency front-of-neck access: first with a cannula technique (14-gauge cannula insertion with ventilation using a Rapid-O2® cricothyroidotomy insufflation device); and subsequently, a scalpel-bougie technique (surgical incision, bougie insertion into trachea and then tracheal tube passed over bougie, with ventilation using a self-inflating bag). The primary end-point was time from declaration of ‘cannot intubate, cannot oxygenate’ to delivery of oxygen via a correctly placed percutaneous device. If a cannula or tracheal tube was not placed within 240 s, the attempt was marked as a failure. There was one failure for the cannula approach and 15 for the scalpel-bougie technique (OR 0.07 (95%CI 0.00–0.43); p <0.001). Median (IQR [range]) time to oxygenation, if successful, was 65 (57–78 [28–160]) s for the cannula approach and 90 (74–115 [40–265]) s for the scalpel-bougie technique (p=0.005). In this ovine model, emergency front-of-neck access using a cannula had a lower chance of failure and (when successful) shorter time to first oxygen delivery compared with a scalpel-bougie technique. 相似文献
3.
Elizabeth L. Barry Jennifer L. Lund Daniel Westreich Leila A. Mott Dennis J. Ahnen Gerald J. Beck Roberd M. Bostick Robert S. Bresalier Carol A. Burke Timothy R. Church Judy R Rees Douglas J. Robertson John A. Baron 《International journal of cancer. Journal international du cancer》2019,144(3):448-458
Calcium supplementation (1,200 mg/day) did not significantly reduce colorectal adenomas in our recent randomized, controlled trial (Vitamin D/Calcium Polyp Prevention Study, VCPPS, 2004–2013) in contrast to our previous trial (Calcium Polyp Prevention Study, CPPS, 1988–1996). To reconcile these findings, we identified participant characteristics that differed between the study populations and modified the effect of calcium supplementation on adenomas or high-risk findings (advanced or multiple adenomas). Compared to the CPPS, more participants in the VCPPS were obese (body mass index (BMI) ≥30 kg/m2; 37.5% vs. 24.4%) and fewer had normal BMI (BMI <25 kg/m2; 18.5% vs. 31%). BMI appeared to modify the effect of calcium supplementation on adenomas and especially on high risk-findings: in the VCPPS, there was a 44% reduction in high-risk findings among individuals whose BMI was normal (RR = 0.56, 95% CI = 0.26–1.23), but not among overweight (RR = 1.09, 95% CI = 0.62–1.91) or obese (RR = 1.54, 95% CI = 0.92–2.57) individuals (pinteraction = 0.03). Similarly, in the CPPS, there was a 56% reduction in high-risk findings among individuals whose BMI was normal (RR = 0.44, 95% CI = 0.26–0.74), but not among overweight (RR = 0.87, 95% CI = 0.55–1.39) or obese (RR = 1.02, 95% CI = 0.57–1.82) individuals (pinteraction = 0.02). Standardization of each trial's findings to the BMI distribution in the other attenuated calcium's protective effect on adenomas in the CPPS but enhanced it in the VCPPS. In conclusion, 1,200 mg/day calcium supplementation may reduce risk of colorectal adenomas among those with normal BMI but not in overweight or obese individuals; and differences in BMI distribution partially account for the apparent difference in calcium efficacy between the two trials. 相似文献
4.
5.
Suzanne M. Gillespie Andrea L. Moser Murthy Gokula Thomas Edmondson Joseph Rees Dallas Nelson Steven M. Handler 《Journal of the American Medical Directors Association》2019,20(2):115-122
Objectives
This document offers guidance to clinicians and facilities on the use of telemedicine to deliver medically necessary evaluation and management of change of condition for nursing home residents.Settings and participants
Members of the telemedicine workgroup of AMDA—The Society for Post-Acute Long-Term Medicine-developed this guideline through both telephonic and face-to-face meetings between April 2017 and September 2018. The guideline is based on the currently available research, experience, and expertise of the workgroup's members, including a summary of a recently completed systematic mixed studies literature review to determine evidence for telemedicine to reduce emergency department visits or hospitalizations of nursing home residents.Results
Research and experience to date support the use of telemedicine as a tool in change of condition assessment and management as a means of reducing unnecessary emergency department visits and hospitalization. Telemedicine-delivered care should be integrated into the primary care of the resident and delivered by providers with competency in post-acute long-term care. The development and sustainability of telemedicine programs is heavily dependent on financial implications. Quality measures should be defined for telemedicine programs in nursing homes.Conclusions/Implications
Telemedicine programs in nursing homes can contribute to the delivery of timely, high quality medical care, which reduces unnecessary hospitalization. Reimbursement for telemedicine-driven care should be based upon medical necessity of visits to care and the maintenance of quality standards. More studies are needed to understand which telemedicine tools and processes are most effective in improving outcomes for nursing home residents. 相似文献6.
Tay Alvin Kuowei Mohsin Mohammed Rees Susan Tam Natalino Kareth Moses Silove Derrick 《Social psychiatry and psychiatric epidemiology》2019,54(6):771-780
Social Psychiatry and Psychiatric Epidemiology - Refugees may be at risk of experiencing a complicated form of bereavement. As yet, however, the nosological status of this putative category across... 相似文献
7.
8.
Penelope Hasking Mark E Boyes Amy Finlay-Jones Peter M. McEvoy Clare S. Rees 《Archives of Suicide Research》2019,23(2):247-260
We investigated whether rumination and self-compassion moderate and/or mediate the relationships between negative affect and both non-suicidal self-injury (NSSI) and suicide ideation. Undergraduate university students (n?=?415) completed well-validated measures of negative affect, rumination, self-compassion, NSSI, and suicide ideation. Neither rumination nor self-compassion moderated associations between negative affect and NSSI and suicide ideation. However, both rumination and self-compassion mediated associations between negative affect and lifetime history of NSSI and suicide ideation. Self-compassion additionally mediated the association between negative affect and both 12-month NSSI and suicide ideation. The salience of self-compassion, particularly in predicting recent NSSI and suicide ideation, offers promise for early intervention initiatives focusing on less judgmental or self-critical means of self-relation. 相似文献
9.
Gwyneth R. Milbrath MSN MPH RN Pamela B. DeGuzman PhD MBA RN 《Public health nursing (Boston, Mass.)》2015,32(4):349-358
Researchers interested in measuring neighborhood‐level effects should understand how “neighborhood” is defined within nursing sciences and other sciences, and the inherent strengths and weaknesses of current research methodologies. This concept analysis provides clarity around the concept of neighborhood within the context of health, analyzes the current state of development of the neighborhood concept, and proposes areas for future nursing research. Using the Rodger's Method of analysis, the concept of neighborhood within nursing and public health research is described based on existing literature. The concept's attributes, related concepts, antecedents, and consequences are given from the literature. Comparisons of the use of neighborhood are made between nursing, public health, sociology, and other sciences. The evolution of the concept of neighborhood throughout history is described, and important implications for future research are discussed. 相似文献
10.