全文获取类型
收费全文 | 97122篇 |
免费 | 7156篇 |
国内免费 | 219篇 |
专业分类
耳鼻咽喉 | 770篇 |
儿科学 | 3884篇 |
妇产科学 | 3171篇 |
基础医学 | 12212篇 |
口腔科学 | 1073篇 |
临床医学 | 15168篇 |
内科学 | 17871篇 |
皮肤病学 | 1496篇 |
神经病学 | 9198篇 |
特种医学 | 1887篇 |
外国民族医学 | 71篇 |
外科学 | 8883篇 |
综合类 | 1106篇 |
一般理论 | 176篇 |
预防医学 | 13872篇 |
眼科学 | 1206篇 |
药学 | 5337篇 |
1篇 | |
中国医学 | 172篇 |
肿瘤学 | 6943篇 |
出版年
2023年 | 706篇 |
2022年 | 973篇 |
2021年 | 2460篇 |
2020年 | 1554篇 |
2019年 | 2462篇 |
2018年 | 2838篇 |
2017年 | 2016篇 |
2016年 | 2212篇 |
2015年 | 2364篇 |
2014年 | 3276篇 |
2013年 | 5088篇 |
2012年 | 7255篇 |
2011年 | 7563篇 |
2010年 | 4031篇 |
2009年 | 3644篇 |
2008年 | 6500篇 |
2007年 | 6895篇 |
2006年 | 6490篇 |
2005年 | 6347篇 |
2004年 | 5957篇 |
2003年 | 5508篇 |
2002年 | 5204篇 |
2001年 | 683篇 |
2000年 | 463篇 |
1999年 | 703篇 |
1998年 | 1091篇 |
1997年 | 847篇 |
1996年 | 731篇 |
1995年 | 657篇 |
1994年 | 621篇 |
1993年 | 581篇 |
1992年 | 387篇 |
1991年 | 354篇 |
1990年 | 339篇 |
1989年 | 275篇 |
1988年 | 283篇 |
1987年 | 263篇 |
1986年 | 255篇 |
1985年 | 287篇 |
1984年 | 328篇 |
1983年 | 313篇 |
1982年 | 386篇 |
1981年 | 399篇 |
1980年 | 294篇 |
1979年 | 197篇 |
1978年 | 171篇 |
1977年 | 195篇 |
1976年 | 172篇 |
1975年 | 140篇 |
1974年 | 136篇 |
排序方式: 共有10000条查询结果,搜索用时 125 毫秒
31.
32.
Elizabeth A. Mosley PhD MPH Amy J. Schulz PhD MPH MSW Lisa H. Harris MD PhD Barbara A. Anderson PhD 《Women & health》2020,60(7):806-820
ABSTRACT Abortion is legal in South Africa, but negative abortion attitudes remain common and are poorly understood. We used nationally representative South African Social Attitudes Survey data to analyze abortion attitudes in the case of fetal anomaly and in the case of poverty from 2007 to 2016 (n = 20,711; ages = 16+). We measured correlations between abortion attitudes and these important predictors: religiosity, attitudes about premarital sex, attitudes about preferential hiring and promotion of women, and attitudes toward family gender roles. Abortion acceptability for poverty increased over time (b = 0.05, p < .001), but not for fetal anomaly (b = ?0.008, p = .284). Highly religious South Africans reported lower abortion acceptability in both cases (Odds Ratio (OR)anomaly = 0.85, p = .015; ORpoverty = 0.84, p = .02). Premarital sex acceptability strongly and positively predicted abortion acceptability (ORanomaly = 2.63, p < .001; ORpoverty = 2.46, p < .001). Attitudes about preferential hiring and promotion of women were not associated with abortion attitudes, but favorable attitudes about working mothers were positively associated with abortion acceptability for fetal anomaly ((ORanomaly = 1.09, p = .01; ORpoverty = 1.02, p = .641)). Results suggest negative abortion attitudes remain common in South Africa and are closely tied to religiosity, traditional ideologies about sexuality, and gender role expectations about motherhood. 相似文献
33.
Soosai Manickam Amirtham Ozlem Ozbey Upasana Kachroo Boopalan Ramasamy Elizabeth Vinod 《Clinical anatomy (New York, N.Y.)》2020,33(3):343-349
Bone containing tissues such as osteochondral joint are resistant to routine tissue processing, therefore require decalcification. This technique causes removal of mineral salts, but in the process may macerate the organic tissue, hence the need for tissue fixation. Such severe processing demands careful antigen retrieval to necessitate optimal staining. The aim of our study was to compare five different antigen retrieval protocols (heat retrieval and protein digestion) following decalcification of rabbit knee joints using two different techniques (20% formic acid and 10% ethylenediamine-tetra acetic acid: EDTA). Osteochondral sections were compared based on time required for decalcification, ease of sectioning, morphological integrity using HE staining and antigen preservation (Collagen type II) using immunohistochemistry. The two decalcification solutions did not impair the tissue morphology and ease of sectioning. Joints processed with formic acid decalcified four times faster than EDTA. Among the five antigen retrieval approaches, maximal collagen II uptake with minimal nonspecific staining was found with protein digestion (pronase and hyaluronidase) in both formic acid and EDTA sections. For osteo-chondral sections, we recommend using 10% EDTA for decalcification and pronase plus hyaluronidase for antigen retrieval if maintaining tissue morphology is crucial, whereas if time is of the essence, 20% FA with pronase plus hyaluronidase is the faster option while still preserving structural integrity. Clin. Anat. 33:343–349, 2020. © 2019 Wiley Periodicals, Inc. 相似文献
34.
35.
36.
37.
38.
Hanna Lee Mary K. Tan Andrew T. Yan Paul Angaran Paul Dorian Claudia Bucci Jean C. Gregoire Alan D. Bell Martin S. Green Peter L. Gross Allan Skanes Charles R. Kerr L. Brent Mitchell Jafna L. Cox Vidal Essebag Brett Heilbron Krishnan Ramanathan Carl Fournier Shaun G. Goodman 《The Canadian journal of cardiology》2019,35(2):160-168
Background
Physicians treating nonvalvular atrial fibrillation (AF) assess stroke and bleeding risks when deciding on anticoagulation. The agreement between empirical and physician-estimated risks is unclear. Furthermore, the association between patient and physician sex and anticoagulation decision-making is uncertain.Methods
We pooled data from 2 national primary care physician chart audit databases of patients with AF (Facilitating Review and Education to Optimize Stroke Prevention in Atrial Fibrillation and Coordinated National Network to Engage Physicians in the Care and Treatment of Patients with Atrial Fibrillation Chart Audit) with a combined 1035 physicians (133 female, 902 male) and 10,927 patients (4567 female and 6360 male).Results
Male physicians underestimated stroke risk in female patients and overestimated risk in male patients. Female physicians estimated stroke risk well in female patients but underestimated the risk in male patients. Risk of bleeding was underestimated in all. Despite differences in risk assessment by physician and patient sex, > 90% of patients received anticoagulation across all subgroups. There was modest agreement between physician estimated and calculated (ie, CHADS2 score) stroke risk: Kappa scores were 0.41 (0.35-0.47) for female physicians and 0.34 (0.32-0.36) for male physicians.Conclusions
Our study is the first to examine the association between patient and physician sex influences and stroke and bleeding risk estimation in AF. Although there were differences in agreement between physician estimated stroke risk and calculated CHADS2 scores, these differences were small and unlikely to affect clinical practice; further, despite any perceived differences in the accuracy of risk assessment by sex, most patients received anticoagulation. 相似文献39.
40.