全文获取类型
收费全文 | 14400篇 |
免费 | 993篇 |
国内免费 | 21篇 |
专业分类
耳鼻咽喉 | 90篇 |
儿科学 | 487篇 |
妇产科学 | 377篇 |
基础医学 | 1824篇 |
口腔科学 | 79篇 |
临床医学 | 2099篇 |
内科学 | 2663篇 |
皮肤病学 | 180篇 |
神经病学 | 1342篇 |
特种医学 | 303篇 |
外科学 | 1322篇 |
综合类 | 167篇 |
一般理论 | 16篇 |
预防医学 | 2010篇 |
眼科学 | 178篇 |
药学 | 973篇 |
中国医学 | 15篇 |
肿瘤学 | 1289篇 |
出版年
2023年 | 90篇 |
2022年 | 112篇 |
2021年 | 331篇 |
2020年 | 219篇 |
2019年 | 377篇 |
2018年 | 406篇 |
2017年 | 310篇 |
2016年 | 330篇 |
2015年 | 389篇 |
2014年 | 503篇 |
2013年 | 775篇 |
2012年 | 1184篇 |
2011年 | 1161篇 |
2010年 | 605篇 |
2009年 | 578篇 |
2008年 | 934篇 |
2007年 | 1093篇 |
2006年 | 1017篇 |
2005年 | 1021篇 |
2004年 | 897篇 |
2003年 | 871篇 |
2002年 | 745篇 |
2001年 | 100篇 |
2000年 | 58篇 |
1999年 | 112篇 |
1998年 | 150篇 |
1997年 | 113篇 |
1996年 | 92篇 |
1995年 | 104篇 |
1994年 | 83篇 |
1993年 | 72篇 |
1992年 | 46篇 |
1991年 | 37篇 |
1990年 | 39篇 |
1989年 | 29篇 |
1988年 | 36篇 |
1987年 | 34篇 |
1986年 | 28篇 |
1985年 | 22篇 |
1984年 | 42篇 |
1983年 | 29篇 |
1982年 | 40篇 |
1981年 | 40篇 |
1980年 | 28篇 |
1979年 | 16篇 |
1978年 | 18篇 |
1977年 | 10篇 |
1976年 | 18篇 |
1975年 | 13篇 |
1974年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 718 毫秒
31.
32.
Robert A. Schnoll Ph.D. James Calvin B.A. Michael Malstrom B.S. Randi L. Rothman B.A. Hao Wang M.S. James Babb Ph.D. Suzanne M. Miller Ph.D. John A. Ridge M.D. Ph.D. Benjamin Movsas M.D. Corey Langer M.D. Michael Unger M.D. Melvyn Goldberg M.D. 《Annals of behavioral medicine》2003,25(3):214-221
Even though continued smoking by cancer patients adversely affects survival and quality of life, about one third of patients
who smoked prior to their diagnosis continue to smoke after their diagnosis. The implementation of smoking cessation treatments
for cancer patients has been slowed by the lack of data on correlates of tobacco use in this population. Thus, this longitudinal
study assessed demographic, medical, addiction, and psychological predictors of tobacco use among 74 head, neck, and lung
cancer patients. Multivariable binary logistic regression analyses, with outcome categorized as smoker or nonsmoker, indicated
that the likelihoodthat patients would be a smoker was associated with lower levels of perceived risk and a higher level of
quitting cons. Multivariable nominal logistic regression, with outcome classified as continuous smoker, continuous quitter,
relapser, or follow-up quitter, indicated that: (a) patients categorized as continuous smokers reported significantly lower
quitting self-efficacy than follow-up quitters and continuous quitters, (b) relapsers reported a significantly lower level
of quitting self-efficacy than either follow-up quitters or continuous quitters, and (c) continuous smokers exhibited a significantly
lower level of risk perceptions than continuous abstainers. These findings can be useful for the development and evaluation
of treatments to promote smoking cessation among cancer patients.
Support for this study was provided by National Institutes of Health Grants CA57708, CA06927, CA88610, CA95678, and CA76644. 相似文献
33.
Suzanne D. LeBlang M.D. Diego B. Nuñez M.D. Anton Serafini M.D. Robert C. Duncan Ph.D. M. Judith Donovan Post M.D. Berta M. Montalvo M.D. Jose I. Becerra M.D. 《Emergency radiology》1997,4(4):191-199
The purpose of this study was to evaluate the ability of helical computed tomography (CT) to detect arterial injuries in gunshot wounds to the neck. In a blinded retrospective review, 54 helical CT scans of the cervical spine were evaluated for bullet/bone fragments, subcutaneous air, bullet path, hematoma, spine fractures, and pharyngoesophageal compromise. The distance of fragments to a major vessel was calculated. CT findings that correlated significantly with major arterial injury included the presence of fragments (bullet/bone) close to a major vessel (2.5 mm) and spine fractures. Visualizing fragments <5 mm from a vessel or a transcervical bullet trajectory predicted 12 of 13 major arterial injuries. We conclude that CT clearly depicts anatomic damage. Specific findings, such as the location of fragments and bullet trajectory adjacent to a vessel and spine fractures, indicate a higher probability of vascular damage, thus directing more definitive evaluation. 相似文献
34.
Sarah N. Flier M.D. Suzanne Rose M.D. M.S.Ed. 《The American journal of gastroenterology》2006,101(S3):S644-S653
Dyspepsia is a remarkably common symptom in the general population. Although multiple definitions have been used to describe the symptom, the most common explanation is that of chronic or recurrent pain or discomfort (a subjective negative feeling that may be associated with early satiety, fullness, bloating, or nausea) centered in the upper abdomen. When a thorough evaluation of a dyspeptic patient fails to identify a cause for her symptoms, the label of nonulcer or functional dyspepsia is applied. Functional dyspepsia is a heterogeneous disorder characterized by relapsing and remitting symptoms. Treatment strategies should focus on alleviating the most bothersome symptom and can be based on the proposed underlying pathophysiology. The effect of gender on mechanisms of disease, symptom presentation, and treatment response is an area of increasing interest and study. As with other functional gastrointestinal disorders, there appear to be some gender-specific features of functional dyspepsia. Specifically, gender-related differences have been observed in some studies of both the prevalence of individual dyspepsia symptoms, and in gastric emptying and proximal gastric motor function. There also appear to be gender differences in the psychosocial realm, with dyspeptic women experiencing a lesser sense of well-being than dyspeptic men, as well as an association of an abuse history with functional dyspepsia. This review will highlight specific gender differences related to the symptom presentation, pathophysiology, and approach to treatment of functional dyspepsia, while noting where differences have not been found and where further investigation is warranted. 相似文献
35.
36.
37.
38.
39.
40.