全文获取类型
收费全文 | 28165篇 |
免费 | 1864篇 |
国内免费 | 277篇 |
专业分类
耳鼻咽喉 | 540篇 |
儿科学 | 353篇 |
妇产科学 | 373篇 |
基础医学 | 4635篇 |
口腔科学 | 828篇 |
临床医学 | 2525篇 |
内科学 | 5470篇 |
皮肤病学 | 1041篇 |
神经病学 | 2106篇 |
特种医学 | 1645篇 |
外科学 | 3471篇 |
综合类 | 140篇 |
现状与发展 | 3篇 |
一般理论 | 8篇 |
预防医学 | 1130篇 |
眼科学 | 497篇 |
药学 | 2649篇 |
中国医学 | 426篇 |
肿瘤学 | 2466篇 |
出版年
2023年 | 210篇 |
2022年 | 733篇 |
2021年 | 1087篇 |
2020年 | 587篇 |
2019年 | 805篇 |
2018年 | 944篇 |
2017年 | 750篇 |
2016年 | 1103篇 |
2015年 | 1500篇 |
2014年 | 1573篇 |
2013年 | 1878篇 |
2012年 | 2693篇 |
2011年 | 2493篇 |
2010年 | 1515篇 |
2009年 | 1189篇 |
2008年 | 1651篇 |
2007年 | 1454篇 |
2006年 | 1248篇 |
2005年 | 1175篇 |
2004年 | 936篇 |
2003年 | 826篇 |
2002年 | 677篇 |
2001年 | 406篇 |
2000年 | 390篇 |
1999年 | 311篇 |
1998年 | 143篇 |
1997年 | 125篇 |
1996年 | 85篇 |
1995年 | 68篇 |
1994年 | 71篇 |
1993年 | 64篇 |
1992年 | 112篇 |
1991年 | 130篇 |
1990年 | 111篇 |
1989年 | 97篇 |
1988年 | 90篇 |
1987年 | 76篇 |
1986年 | 78篇 |
1985年 | 62篇 |
1984年 | 42篇 |
1983年 | 38篇 |
1979年 | 53篇 |
1978年 | 37篇 |
1975年 | 52篇 |
1974年 | 29篇 |
1972年 | 39篇 |
1971年 | 49篇 |
1970年 | 34篇 |
1969年 | 27篇 |
1968年 | 31篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
981.
982.
983.
984.
985.
986.
987.
Eun Hye Lee Keum Won Kim Young Joong Kim Dong-Rock Shin Young Mi Park Hyo Soon Lim Jeong Seon Park Hye-Won Kim You Me Kim Hye Jung Kim Jae Kwan Jun 《Korean journal of radiology》2016,17(4):489-496
ObjectiveTo analyze the diagnostic accuracy and trend in screening mammography in Korea.ResultsWe enrolled 128756 cases from 10 hospitals from 2005 to 2010. The recall rate was 19.1% with a downward trend over time (-12.1% per year; 95% CI, -15.9 to -8.2). The CDR was 2.69 per 1000 examinations, without a significant trend. The PPV was 1.4% with an upward trend (20.8% per year; 95% CI, 15.2 to 26.7). The sensitivity was 86.5% without a significant trend, whereas the specificity was 81.1% with an upward trend (3.3% per year; 95% CI, 2.1 to 4.5). The FPR was 18.9% with a downward trend (-12.4% per year; 95% CI, -16.2 to -8.4). The ICR was 0.5 per 1000 negative examinations without a significant trend. There were institutional variations in the diagnostic accuracy and trend except for the CDR, sensitivity, and ICR.ConclusionThe sensitivity and CDR of screening mammography in the ABCS-K from 2005 to 2010 were compatible with those for Western women. The recall rate, PPV and specificity, however, were suboptimal, although they showed significant improvements over this period. A further analysis is required to explain institutional variations. 相似文献
988.
Kyung Jin Nam Ki Seok Choo Ung Bae Jeon Tae Un Kim Jae-Yeon Hwang Jeong A Yeom Hee Seok Jeong Yoon Young Choi Jin You Kim Sang Hyup Lee Hyun Yul Kim Youn Joo Jung Young Hye Cho 《Japanese journal of radiology》2016,34(6):409-413
Purpose
We compared maximal diameters of ipsilateral (IMA) and contralateral (IMA) internal mammary arteries in patients with unilateral breast cancer and analyze the implications of enlargements of ipsilateral or contralateral IMAs in relation to histopathologic factors.Materials and methods
Of 568 women who underwent breast magnetic resonance imaging (MRI) examinations from January 2009 to May 2012, 196 had unilateral, histologically proven breast cancer. In 156 women, maximal IMA diameters in the second intercostal space were measured by two blinded radiologists in left and right sides using nonenhanced axial T2-weighted turbo spin-echo sequence images.Results
In the 156 study patients, mean maximal diameter of ipsilateral IMAs (2.37 ± 0.60 mm) was significantly larger than that of contralateral IMAs (2.03 ± 0.58 mm) (p = 0.00). Ipsilateral IMA enlargement was present in 66.7 % of the patients (104 of 156). Furthermore, ipsilateral IMA enlargement was found to be significantly associated with human epidermal growth factor receptor-2 (HER-2) expression (p = 0.039).Conclusions
Maximal IMA diameter was significantly greater in ipsilateral sides in breast cancer patients. Findings suggest ipsilateral IMA enlargement detected by MRI might be a useful additional predictor of HER-2 expression in unilateral breast cancer.989.