全文获取类型
收费全文 | 26591篇 |
免费 | 2244篇 |
国内免费 | 44篇 |
专业分类
耳鼻咽喉 | 274篇 |
儿科学 | 929篇 |
妇产科学 | 717篇 |
基础医学 | 3160篇 |
口腔科学 | 435篇 |
临床医学 | 4137篇 |
内科学 | 4813篇 |
皮肤病学 | 325篇 |
神经病学 | 1996篇 |
特种医学 | 1033篇 |
外国民族医学 | 3篇 |
外科学 | 3134篇 |
综合类 | 551篇 |
一般理论 | 37篇 |
预防医学 | 3254篇 |
眼科学 | 750篇 |
药学 | 1941篇 |
中国医学 | 22篇 |
肿瘤学 | 1368篇 |
出版年
2023年 | 126篇 |
2022年 | 178篇 |
2021年 | 455篇 |
2020年 | 328篇 |
2019年 | 490篇 |
2018年 | 534篇 |
2017年 | 371篇 |
2016年 | 467篇 |
2015年 | 481篇 |
2014年 | 675篇 |
2013年 | 1062篇 |
2012年 | 1403篇 |
2011年 | 1606篇 |
2010年 | 789篇 |
2009年 | 720篇 |
2008年 | 1410篇 |
2007年 | 1409篇 |
2006年 | 1418篇 |
2005年 | 1383篇 |
2004年 | 1385篇 |
2003年 | 1268篇 |
2002年 | 1186篇 |
2001年 | 622篇 |
2000年 | 634篇 |
1999年 | 586篇 |
1998年 | 310篇 |
1997年 | 276篇 |
1996年 | 257篇 |
1995年 | 244篇 |
1994年 | 208篇 |
1993年 | 195篇 |
1992年 | 440篇 |
1991年 | 432篇 |
1990年 | 412篇 |
1989年 | 418篇 |
1988年 | 367篇 |
1987年 | 343篇 |
1986年 | 342篇 |
1985年 | 332篇 |
1984年 | 284篇 |
1983年 | 242篇 |
1982年 | 180篇 |
1981年 | 140篇 |
1979年 | 195篇 |
1978年 | 171篇 |
1977年 | 142篇 |
1976年 | 130篇 |
1974年 | 162篇 |
1973年 | 144篇 |
1972年 | 129篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
The choice of therapies for Crohn's disease has expanded greatly over the past 30 years. Increasingly it is important that we attempt to identify subgroups of patients who will benefit most from each type of therapy. This article reviews the therapeutic options currently available, organized by the goal the practitioner hopes to achieve. Imaging is one critical way of aiding the classification of Crohn's disease by attempting to accurately determine the location, extent and, most importantly, the nature of the disease. 相似文献
34.
35.
Background The incidence rate of incisional hernias after open surgery has been reported to be higher than that of port site hernias
after laparoscopic surgery. No studies have compared the costs for the health care system in treating those two types of hernia.
Methods A systematic review was conducted to obtain the baseline data, and a decision analysis model was created to simulate the occurrence
and recurrence of incisional and port site hernias.
Results The overall risk of having incisional hernias was eight-times higher than that of having port site hernias (7.4% vs 0.9%).
A cost savings of £93 per patient can be generated for the health care system in the UK. Similar results were obtained for
Germany, Italy and France.
Conclusions The additional treatment costs for incisional hernia should be taken into account when the costs of a surgery performed by
open approach are compared with by laparoscopy. 相似文献
36.
Jesse M. Pines MD MBA Debra G. Perina MD William J. Brady MD 《Academic emergency medicine》2004,11(9):982-984
OBJECTIVES: To determine the type of electrocardiogram (ECG) interpretation instruction in emergency medicine (EM) residency programs, the use and perceived value of teaching modalities and resources, and the methods used to assess competency of ECG interpretation. METHODS: An interactive survey instrument was posted on the Internet using SurveySuite, Inc., software and e-mailed to program directors (PDs) of all 125 Accreditation Council for Graduate Medical Education-approved U.S. EM residency programs. Responses are reported in total numbers and percentages. RESULTS: Ninety-nine of 125 PDs completed the online survey (response rate, 79.2%). Emergency department instruction (99%), case-based lectures (98%), and didactic lectures (98%) were most commonly used to teach interpretation of ECGs, followed by computer-based instruction (34%) and ECG laboratory (12%). The majority of programs (53%) spent more than eight hours on formal ECG lectures per year, while 11% spent less than three hours. Observation during clinical time (99%), lecture time (76%), and hypothetical cases (57%) were the most common ways to determine competency in reading ECGs, while clinical observation and hypothetical cases were perceived as the most valuable. The most commonly used resource was personal or departmental ECG files (91%), and this had the highest perceived value. The majority of PDs were comfortable with residents' abilities to read ECGs by the third year (96%) and fourth year (91%) of residency. CONCLUSIONS: These data suggest that EM PDs believe that EM residency is adequately preparing graduates to interpret ECGs. This goal is achieved through a variety of methods. 相似文献
37.
38.
Andrew F Shorr William L Jackson Brendan M Weiss Lisa K Moores 《Blood coagulation & fibrinolysis》2007,18(4):309-316
Multiple options exist for the prevention of deep vein thrombosis (DVT) in medical inpatients. We sought to determine the cost-effectiveness of low-molecular-weight heparin (LMWH) relative to unfractionated heparin (UFH) for DVT prevention in this setting. We conducted a cost-effectiveness analysis from the perspective of a third-party payer employing a decision model and literature-based estimates for inputs. In the base-case analysis, LMWH had little impact on the rate of DVT. Despite higher acquisition costs, however, LMWHs resulted in net savings. Routine use of LMWH saves approximately US$89 per patient. The lower rate of heparin-induced thrombocytopenia (HIT) with LMWH accounted for this differential. Univariate sensitivity analysis revealed the model was moderately sensitive to the odds ratio of HIT with LMWH and the cost of HIT. Multivariate sensitivity analysis confirmed the LMWH approach dominated financially. 'Worst-case' scenario modeling, where LMWH actually increased the risk for DVT, had little effect on the rate of HIT, and was substantially more costly than UFH, still demonstrated that LMWHs were economically superior. Monte-Carlo simulation indicated the 95% confidence interval around the estimate for savings with LMWH ranged from US$7 to US$373. We conclude that, despite their higher cost, LMWHs for thromboprophylaxis in medical patients result in savings. 相似文献
39.
40.
Justine Royle Rachel Williamson Mark Strachan Marie O’Donnell Simon Jackson Thanos Argryopoulos Alan McNeill 《British journal of medical & surgical urology》2009,2(5):204-207
Emphysematous pyelonephritis is a severe life-threatening infection which continues to carry significant morbidity and mortality. We present a case recently managed at our institution by laparoscopic nephrectomy. The patient survived, and in comparison to some of the more conventionally managed patients in the literature, made an extremely speedy recovery. We would advocate this option to be seriously considered when patients are suitable and appropriately trained surgeons are available. 相似文献