全文获取类型
| 收费全文 | 212726篇 |
| 免费 | 15327篇 |
| 国内免费 | 755篇 |
专业分类
| 耳鼻咽喉 | 2313篇 |
| 儿科学 | 5552篇 |
| 妇产科学 | 4352篇 |
| 基础医学 | 27442篇 |
| 口腔科学 | 4586篇 |
| 临床医学 | 20236篇 |
| 内科学 | 45530篇 |
| 皮肤病学 | 2765篇 |
| 神经病学 | 20511篇 |
| 特种医学 | 7022篇 |
| 外国民族医学 | 13篇 |
| 外科学 | 33161篇 |
| 综合类 | 3455篇 |
| 现状与发展 | 2篇 |
| 一般理论 | 293篇 |
| 预防医学 | 19271篇 |
| 眼科学 | 4438篇 |
| 药学 | 14536篇 |
| 1篇 | |
| 中国医学 | 374篇 |
| 肿瘤学 | 12955篇 |
出版年
| 2023年 | 850篇 |
| 2022年 | 1420篇 |
| 2021年 | 3460篇 |
| 2020年 | 2128篇 |
| 2019年 | 3421篇 |
| 2018年 | 4011篇 |
| 2017年 | 3237篇 |
| 2016年 | 3440篇 |
| 2015年 | 4088篇 |
| 2014年 | 6158篇 |
| 2013年 | 8896篇 |
| 2012年 | 13226篇 |
| 2011年 | 14433篇 |
| 2010年 | 8150篇 |
| 2009年 | 7379篇 |
| 2008年 | 13685篇 |
| 2007年 | 14503篇 |
| 2006年 | 13999篇 |
| 2005年 | 14475篇 |
| 2004年 | 13879篇 |
| 2003年 | 12991篇 |
| 2002年 | 12531篇 |
| 2001年 | 1932篇 |
| 2000年 | 1522篇 |
| 1999年 | 2112篇 |
| 1998年 | 2849篇 |
| 1997年 | 2463篇 |
| 1996年 | 2222篇 |
| 1995年 | 1970篇 |
| 1994年 | 1775篇 |
| 1993年 | 1675篇 |
| 1992年 | 1264篇 |
| 1991年 | 1217篇 |
| 1990年 | 1113篇 |
| 1989年 | 1028篇 |
| 1988年 | 1071篇 |
| 1987年 | 1090篇 |
| 1986年 | 1052篇 |
| 1985年 | 1130篇 |
| 1984年 | 1526篇 |
| 1983年 | 1494篇 |
| 1982年 | 1834篇 |
| 1981年 | 1663篇 |
| 1980年 | 1578篇 |
| 1979年 | 855篇 |
| 1978年 | 995篇 |
| 1977年 | 966篇 |
| 1976年 | 849篇 |
| 1975年 | 698篇 |
| 1974年 | 695篇 |
排序方式： 共有10000条查询结果，搜索用时 0 毫秒
11.
12.
Katherine M. Duszynski Nicole L. Pratt John W. Lynch Jesia G. Berry Michael S. Gold 《Vaccine》2019,37(2):280-288
Objective
To determine whether differences in combination DTaP vaccine types at 2, 4 and 6?months of age were associated with mortality (all-cause or non-specific), within 30?days of vaccination.Design
Observational nationwide cohort study.Setting
Linked population data from the Australian Childhood Immunisation Register and National Death Index.Participants
Australian infants administered a combination trivalent, quadrivalent or hexavalent DTaP vaccine (DTaP types) between January 1999 and December 2010 at 2, 4 and 6?months as part of the primary vaccination series. The study population included 2.9, 2.6, & 2.3?million children in the 2, 4 and 6?month vaccine cohorts, respectively.Main outcome measures
Infants were evaluated for the primary outcome of all-cause mortality within 30?days. A secondary outcome was non-specific mortality (unknown cause of death) within 30?days of vaccination. Non-specific mortality was defined as underlying or other cause of death codes, R95 ‘Sudden infant death syndrome’, R96 ‘Other sudden death, cause unknown’, R98 ‘Unattended death’, R99 ‘Other ill-defined and unspecified cause of mortality’ or where no cause of death was recorded.Results
The rate of 30?day all-cause mortality was low and declined from 127.4 to 59.3 deaths per 100,000 person-years between 2 and 6?month cohorts. When compared with trivalent DTaP vaccines, no elevated risk in all-cause or non-specific mortality was seen with any quadrivalent or hexavalent DTaP vaccines, for any cohort.Conclusion
Use of routine DTaP combination vaccines with differing disease antigens administered during the first six months of life is not associated with infant mortality. 相似文献13.
14.
15.
Evaluation of training nurses to perform semi‐automated three‐dimensional left ventricular ejection fraction using a customised workstation‐based training protocol 
下载免费PDF全文
下载免费PDF全文 16.
17.
Bimal Bhindi Christine M. Lohse Phillip J. Schulte Ross J. Mason John C. Cheville Stephen A. Boorjian Bradley C. Leibovich R. Houston Thompson 《European urology》2019,75(5):766-772
Background
Partial nephrectomy (PN) is generally favored for cT1 tumors over radical nephrectomy (RN) when technically feasible. However, it can be unclear whether the additional risks of PN are worth the magnitude of renal function benefit.Objective
To develop preoperative tools to predict long-term estimated glomerular filtration rate (eGFR) beyond 30 d following PN and RN, separately.Design, setting, and participants
In this retrospective cohort study, patients who underwent RN or PN for a single nonmetastatic renal tumor between 1997 and 2014 at our institution were identified. Exclusion criteria were venous tumor thrombus and preoperative eGFR <15 ml/min/1.73 m2.Intervention
RN and PN.Outcome measurements and statistical analysis
Hierarchical generalized linear mixed-effect models with backward selection of candidate preoperative features were used to predict long-term eGFR following RN and PN, separately. Predictive ability was summarized using marginal , which ranges from 0 to 1, with higher values indicating increased predictive ability.Results and limitations
The analysis included 1152 patients (13 206 eGFR observations) who underwent RN and 1920 patients (18 652 eGFR observations) who underwent PN, with mean preoperative eGFRs of 66 ml/min/1.73 m2 (standard deviation [SD] = 18) and 72 ml/min/1.73 m2 (SD = 20), respectively. The model to predict eGFR after RN included age, diabetes, preoperative eGFR, preoperative proteinuria, tumor size, time from surgery, and an interaction between time from surgery and age (marginal ). The model to predict eGFR after PN included age, presence of a solitary kidney, diabetes, hypertension, preoperative eGFR, preoperative proteinuria, surgical approach, time from surgery, and interaction terms between time from surgery and age, diabetes, preoperative eGFR, and preoperative proteinuria (marginal ). Limitations include the lack of data on renal tumor complexity and the single-center design; generalizability needs to be confirmed in external cohorts.Conclusions
We developed preoperative tools to predict renal function outcomes following RN and PN. Pending validation, these tools should be helpful for patient counseling and clinical decision-making.Patient summary
We developed models to predict kidney function outcomes after partial and radical nephrectomy based on preoperative features. This should help clinicians during patient counseling and decision-making in the management of kidney tumors. 相似文献18.
Fabian M. Laage Gaupp Nadia Solomon Ivan Rukundo Azza A. Naif Erick M. Mbuguje Anish Gonchigar Minzhi Xing John D. Prologo Douglas D. Silin Frank J. Minja 《Journal of vascular and interventional radiology : JVIR》2019,30(12):2036-2040
Despite a population of nearly 60 million, there is currently not a single interventional radiologist in Tanzania. Based on an Interventional Radiology (IR) Readiness Assessment, the key obstacles to establishing IR in Tanzania are the lack of training opportunities and limited availability of disposable equipment. An IR training program was designed and initiated, which relies on US-based volunteer teams of IR physicians, nurses, and technologists to locally train radiology residents, nurses, and technologists. Preliminary results support this strategy for addressing the lack of training opportunities and provide a model for introducing IR to other resource-limited settings. 相似文献
19.
20.
Mhd Wasem Alsabbagh Dana Church Lisa Wenger John Papastergiou Lalitha Raman-Wilms Eric Schneider Nancy Waite 《Research in social & administrative pharmacy》2019,15(2):202-206