全文获取类型
收费全文 | 585篇 |
免费 | 12篇 |
国内免费 | 36篇 |
专业分类
儿科学 | 39篇 |
妇产科学 | 2篇 |
基础医学 | 58篇 |
口腔科学 | 8篇 |
临床医学 | 63篇 |
内科学 | 61篇 |
皮肤病学 | 8篇 |
神经病学 | 3篇 |
特种医学 | 195篇 |
外科学 | 56篇 |
综合类 | 19篇 |
预防医学 | 39篇 |
眼科学 | 11篇 |
药学 | 20篇 |
中国医学 | 1篇 |
肿瘤学 | 50篇 |
出版年
2022年 | 3篇 |
2020年 | 2篇 |
2018年 | 6篇 |
2017年 | 4篇 |
2016年 | 5篇 |
2015年 | 11篇 |
2014年 | 12篇 |
2013年 | 10篇 |
2012年 | 8篇 |
2011年 | 11篇 |
2010年 | 21篇 |
2009年 | 37篇 |
2008年 | 23篇 |
2007年 | 34篇 |
2006年 | 33篇 |
2005年 | 29篇 |
2004年 | 18篇 |
2003年 | 12篇 |
2002年 | 20篇 |
2001年 | 31篇 |
2000年 | 9篇 |
1999年 | 25篇 |
1998年 | 29篇 |
1997年 | 34篇 |
1996年 | 23篇 |
1995年 | 11篇 |
1994年 | 9篇 |
1993年 | 12篇 |
1992年 | 12篇 |
1991年 | 5篇 |
1990年 | 10篇 |
1989年 | 21篇 |
1988年 | 20篇 |
1987年 | 10篇 |
1986年 | 11篇 |
1985年 | 7篇 |
1984年 | 3篇 |
1983年 | 4篇 |
1982年 | 2篇 |
1981年 | 7篇 |
1979年 | 6篇 |
1978年 | 2篇 |
1977年 | 4篇 |
1975年 | 3篇 |
1972年 | 2篇 |
1931年 | 1篇 |
1929年 | 2篇 |
1927年 | 2篇 |
1926年 | 7篇 |
1925年 | 3篇 |
排序方式: 共有633条查询结果,搜索用时 15 毫秒
151.
HTLV-1 and blood transfusion 总被引:1,自引:0,他引:1
152.
Percutaneous abdominal biopsy: cost-identification analysis 总被引:1,自引:0,他引:1
153.
154.
155.
156.
157.
158.
J E Tan S G Orel M D Schnall D J Schultz L J Solin 《American journal of clinical oncology》1999,22(4):414-418
Magnetic resonance imaging (MRI) may be more sensitive than mammography for detecting breast cancer and may have an adjunctive role in assessing patients with early-stage disease for breast conservation treatment. This study was performed to analyze the impact of breast MRI on the clinical management of 83 patients being considered for breast conservation treatment. Eighty-three consecutive cases of patients undergoing breast MRI during standard workup and evaluation for breast conservation treatment from 1993 to 1996 were retrospectively reviewed. Records were reviewed for patient and tumor characteristics, mammographic findings, MRI findings, timing of MRI study, findings from MRI-guided surgery (when done), and whether the patient underwent breast conservation treatment. MRI definitely altered management in 15 patients (18%), may have affected management in 4 patients (5%), and did not change management in 64 patients (77%). Thirteen patients underwent additional surgery because of MRI findings; the positive predictive value for MRI-guided surgery was 38% (5 of 13). Ultimately, 82% of the patients received breast conservation treatment. No predictive factor was identified to characterize the patients most likely to have management affected by MRI findings. These findings suggest that breast MRI may be useful in the evaluation of patients with early-stage breast cancer for breast conservation treatment. A larger study population and outcome data will be required to confirm these findings and to define those patients most likely to benefit from breast MRI. 相似文献
159.
Palpable breast masses arising in pediatric and adolescent patients are uncommon. A careful physical examination should be performed first, followed by an ultrasonographic evaluation when a suspect mass is present. In this study population, palpable findings were all due to benign causes, which is concordant with the literature. Benign causes included gynecomastia, cyst, fibroadenoma, lymph node, galactocele, duct ectasia, and infection. Though extremely rare, breast malignancies do occur in the pediatric and adolescent population. 相似文献
160.
This presentation will describe a pilot study of radio-frequency (RF) identification tags ("chips") that was conducted in parallel with standard procedures for the collection and testing of Red Blood Cells (Greater Chesapeake and Potomac Region, American Red Cross Biomedical Services, Baltimore, MD) and transfusion (Georgetown University Hospital, Washington, DC). The purpose of the study was to evaluate whether multi-write RF chips could be attached to blood bags, programmed, and used to facilitate the collection of information from (1) a blood bag manufacturer to (2) a blood collection center and, subsequently, to (3) a hospital transfusion service. 相似文献