全文获取类型
收费全文 | 25742篇 |
免费 | 2857篇 |
国内免费 | 40篇 |
专业分类
耳鼻咽喉 | 302篇 |
儿科学 | 718篇 |
妇产科学 | 621篇 |
基础医学 | 2737篇 |
口腔科学 | 413篇 |
临床医学 | 3400篇 |
内科学 | 5454篇 |
皮肤病学 | 514篇 |
神经病学 | 2380篇 |
特种医学 | 876篇 |
外国民族医学 | 3篇 |
外科学 | 3983篇 |
综合类 | 533篇 |
一般理论 | 43篇 |
预防医学 | 2585篇 |
眼科学 | 402篇 |
药学 | 1586篇 |
中国医学 | 31篇 |
肿瘤学 | 2058篇 |
出版年
2023年 | 234篇 |
2022年 | 187篇 |
2021年 | 470篇 |
2020年 | 400篇 |
2019年 | 464篇 |
2018年 | 714篇 |
2017年 | 506篇 |
2016年 | 515篇 |
2015年 | 572篇 |
2014年 | 829篇 |
2013年 | 1140篇 |
2012年 | 1260篇 |
2011年 | 1267篇 |
2010年 | 938篇 |
2009年 | 917篇 |
2008年 | 1219篇 |
2007年 | 1282篇 |
2006年 | 1305篇 |
2005年 | 1246篇 |
2004年 | 1118篇 |
2003年 | 1028篇 |
2002年 | 954篇 |
2001年 | 676篇 |
2000年 | 681篇 |
1999年 | 620篇 |
1998年 | 340篇 |
1997年 | 274篇 |
1996年 | 277篇 |
1995年 | 282篇 |
1994年 | 202篇 |
1993年 | 185篇 |
1992年 | 440篇 |
1991年 | 431篇 |
1990年 | 370篇 |
1989年 | 380篇 |
1988年 | 338篇 |
1987年 | 320篇 |
1986年 | 301篇 |
1985年 | 321篇 |
1984年 | 271篇 |
1983年 | 225篇 |
1982年 | 174篇 |
1981年 | 147篇 |
1979年 | 241篇 |
1978年 | 179篇 |
1974年 | 153篇 |
1973年 | 190篇 |
1972年 | 187篇 |
1971年 | 158篇 |
1969年 | 147篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
3.
Jamaal L. Benjamin MD PhD Rebecca Dennis DO Stacy White Jr MD David Munson MD Sudha A. Anupindi MD Maciej Piskunowicz MD Kassa Darge MD PhD Ami Gokli MD Misun Hwang MD 《Journal of ultrasound in medicine》2020,39(5):1031-1036
Bowel diseases of prematurity, including necrotizing enterocolitis, are dreaded ailments of neonates. Early diagnosis is difficult, with clinical and radiographic findings often inconclusive. We present a novel use of contrast-enhanced ultrasound in detection of pediatric bowel disease. Early identification of compromised blood flow or an at-risk bowel can be quantitatively detected and monitored. This ability has implications for guidance of emerging therapies, allowing targeting of inflammation. These findings represent an advancement in detection of bowel disease in neonates. 相似文献
4.
5.
6.
7.
8.
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9.
10.
Erin L. Sutfin Jennifer Cornacchione Ross Allison J. Lazard Elizabeth Orlan Cynthia K. Suerken Kimberly D. Wiseman 《Health communication》2019,34(3):343-351
ABSTRACTAdolescents and young adults smoke waterpipe tobacco (WT) and cigarillos, at least in part, based on erroneous beliefs that these products are safer than cigarettes. To address this challenge, we used a systematic, three-phase process to develop a health communication campaign to discourage WT and cigarillo smoking among at-risk (tobacco users and susceptible non-users) 16- to 25-year-olds. In Phase 1, we used a national phone survey (N = 896) to determine salient message beliefs. Participants reported constituents (i.e., harmful chemicals) emitted by the products were worrisome. In Phase 2, we developed and evaluated four message executions, with varying imagery, tone, and unappealing products with the same constituents, using focus groups (N = 38). Participants rated one execution highly, resulting in our development of a campaign where each message: (1) identified a tobacco product and constituent in the smoke; (2) included an image of an unappealing product containing the constituent (e.g., pesticides, gasoline) to grab attention; and (3) used a humorous sarcastic tone. In Phase 3, we tested the campaign messages (17 intervention and six control) with a nationally representative online survey (N = 1,636). Participants rated intervention and control messages highly with few differences between them. Exposure to messages resulted in significant increases in all risk beliefs from pre to post (p < 0.05). For WT, intervention messages increased beliefs about addiction more than control messages (p < 0.05). This systematic, iterative approach resulted in messages that show promise for discouraging WT and cigarillo use. 相似文献