全文获取类型
收费全文 | 38885篇 |
免费 | 7519篇 |
国内免费 | 1528篇 |
专业分类
耳鼻咽喉 | 835篇 |
儿科学 | 805篇 |
妇产科学 | 894篇 |
基础医学 | 2315篇 |
口腔科学 | 2986篇 |
临床医学 | 6516篇 |
内科学 | 7761篇 |
皮肤病学 | 577篇 |
神经病学 | 2748篇 |
特种医学 | 1520篇 |
外国民族医学 | 16篇 |
外科学 | 5667篇 |
综合类 | 3393篇 |
现状与发展 | 17篇 |
一般理论 | 5篇 |
预防医学 | 3872篇 |
眼科学 | 747篇 |
药学 | 2112篇 |
4篇 | |
中国医学 | 914篇 |
肿瘤学 | 4228篇 |
出版年
2024年 | 205篇 |
2023年 | 1376篇 |
2022年 | 1068篇 |
2021年 | 1491篇 |
2020年 | 1904篇 |
2019年 | 1076篇 |
2018年 | 1961篇 |
2017年 | 1886篇 |
2016年 | 2075篇 |
2015年 | 2398篇 |
2014年 | 2964篇 |
2013年 | 3192篇 |
2012年 | 2017篇 |
2011年 | 2245篇 |
2010年 | 2307篇 |
2009年 | 2650篇 |
2008年 | 1615篇 |
2007年 | 1463篇 |
2006年 | 1576篇 |
2005年 | 1374篇 |
2004年 | 969篇 |
2003年 | 887篇 |
2002年 | 789篇 |
2001年 | 854篇 |
2000年 | 694篇 |
1999年 | 803篇 |
1998年 | 798篇 |
1997年 | 790篇 |
1996年 | 749篇 |
1995年 | 608篇 |
1994年 | 465篇 |
1993年 | 380篇 |
1992年 | 299篇 |
1991年 | 253篇 |
1990年 | 218篇 |
1989年 | 208篇 |
1988年 | 203篇 |
1987年 | 178篇 |
1986年 | 144篇 |
1985年 | 124篇 |
1984年 | 93篇 |
1983年 | 98篇 |
1982年 | 89篇 |
1981年 | 74篇 |
1980年 | 51篇 |
1979年 | 39篇 |
1978年 | 32篇 |
1977年 | 43篇 |
1976年 | 31篇 |
1975年 | 27篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Timothy R. Holden MD MS Manish N. Shah MD MPH Tommy A. Gibson Robert E. Weiss PhD Annick N. Yagapen MPH CCRP Susan E. Malveau MSBE David H. Adler MD MPH Aveh Bastani MD Christopher W. Baugh MD MBA Jeffrey M. Caterino MD MPH Carol L. Clark MD MBA Deborah B. Diercks MD MPH Judd E. Hollander MD Bret A. Nicks MD MHA Daniel K. Nishijima MD MAS Kirk A. Stiffler MD Alan B. Storrow MD Scott T. Wilber MD Benjamin C. Sun MD MPP 《Academic emergency medicine》2018,25(8):880-890
Objectives
Syncope and near‐syncope are common in patients with dementia and a leading cause of emergency department (ED) evaluation and subsequent hospitalization. The objective of this study was to describe the clinical trajectory and short‐term outcomes of patients who presented to the ED with syncope or near‐syncope and were assessed by their ED provider to have dementia.Methods
This multisite prospective cohort study included patients 60 years of age or older who presented to the ED with syncope or near‐syncope between 2013 and 2016. We analyzed a subcohort of 279 patients who were identified by the treating ED provider to have baseline dementia. We collected comprehensive patient‐level, utilization, and outcomes data through interviews, provider surveys, and chart abstraction. Outcome measures included serious conditions related to syncope and death.Results
Overall, 221 patients (79%) were hospitalized with a median length of stay of 2.1 days. A total of 46 patients (16%) were diagnosed with a serious condition in the ED. Of the 179 hospitalized patients who did not have a serious condition identified in the ED, 14 (7.8%) were subsequently diagnosed with a serious condition during the hospitalization, and an additional 12 patients (6.7%) were diagnosed postdischarge within 30 days of the index ED visit. There were seven deaths (2.5%) overall, none of which were cardiac‐related. No patients who were discharged from the ED died or had a serious condition in the subsequent 30 days.Conclusions
Patients with perceived dementia who presented to the ED with syncope or near‐syncope were frequently hospitalized. The diagnosis of a serious condition was uncommon if not identified during the initial ED assessment. Given the known iatrogenic risks of hospitalization for patients with dementia, future investigation of the impact of goals of care discussions on reducing potentially preventable, futile, or unwanted hospitalizations while improving goal‐concordant care is warranted.992.
993.
994.
995.
Yuan Tian Ying Yuan Hang Lu Liang Xu Wei Xian Yang Chao Wei Mu Hai Bo Liu Jue Chen Ke Fei Dou Yi Da Tang Jin Qing Yuan Yong Jian Wu Hong Bing Yan Bo Xu Shu Bin Qiao Yue Jin Yang Run Lin Gao Hong Qiu 《The international journal of cardiovascular imaging》2018,34(9):1331-1337
With the development of coronary angiography for the diagnosis of coronary artery disease, its clinical significance in detecting coronary artery anomalies and evaluating the seriousness is attracting more attention. In the study we aimed to assess the prevalence of anomalous origin of coronary arteries in a Chinese population who underwent coronary angiography for coronary artery disease, and explore any patterns in the common variants and typical anomalies, especially the potentially serious ones. Patients who underwent coronary angiography from January 2013 to December 2016 in Fuwai Hospital were included. Baseline characteristics and angiographic data were collected, the incidence of anomalous origin of coronary arteries was calculated, and the typical patterns were analyzed. Comparisons between the present results and those of existing reports were also conducted. A total of 110,158 patients were included in the study, among which 0.76% (835 cases) had anomalous origin of coronary arteries. Among the anomalies, the incidences of anomalous origin of the right coronary artery (RCA), the left coronary artery (LCA), both the RCA and LCA, single coronary artery (SCA) and dextrocardia were 76.76% (641 cases), 14.61% (122 cases), 1.80% (15 cases), 4.67% (39 cases) and 2.16% (18 cases), respectively. Moreover, 47.54% (397 cases) of the anomalies were shown to be potentially serious, and an RCA arising from the left sinus of Valsalva (LSV) was the most common subtype (39.28%, 328 cases). Although anomalous origin of coronary arteries is not quite common, more clinical attention should be paid to this condition due to the potential risk of serious sequelae. 相似文献
996.
Family meals and disordered eating in adolescents: Are the benefits the same for everyone?
下载免费PDF全文
![点击此处可从《The International journal of eating disorders》网站下载免费的PDF全文](/ch/ext_images/free.gif)
997.
Alison M. Darcy PhD Kathleen Kara Fitzpatrick PhD Stephanie M. Manasse BA Nandini Datta BS Megan Klabunde PhD Danielle Colborn PhD Vandana Aspen PhD Colleen Stiles‐Shields MA MS Zandre Labuschagne MA Daniel Le Grange PhD James Lock MD PhD 《The International journal of eating disorders》2015,48(5):487-493
998.
Association between binge eating and attention‐deficit/hyperactivity disorder in two pediatric community mental health clinics
下载免费PDF全文
![点击此处可从《The International journal of eating disorders》网站下载免费的PDF全文](/ch/ext_images/free.gif)
999.
1000.
Testing a sequence of pre‐ordered hypotheses to decide which of these can be rejected or accepted while controlling the familywise error rate (FWER) is of importance in many scientific studies such as clinical trials. In this paper, we first introduce a generalized fixed sequence procedure whose critical values are defined by using a function of the numbers of rejections and acceptances, and which allows follow‐up hypotheses to be tested even if some earlier hypotheses are not rejected. We then construct the least favorable configuration for this generalized fixed sequence procedure and present a sufficient condition for the FWER control under arbitrary dependence. Based on the condition, we develop three new generalized fixed sequence procedures controlling the FWER under arbitrary dependence. We also prove that each generalized fixed sequence procedure can be described as a specific closed testing procedure. Through simulation studies and a clinical trial example, we compare the power performance of these proposed procedures with those of the existing FWER controlling procedures. Finally, when the pairwise joint distributions of the true null p‐values are known, we further improve these procedures by incorporating pairwise correlation information while maintaining the control of the FWER. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献