全文获取类型
收费全文 | 2028篇 |
免费 | 107篇 |
国内免费 | 40篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 154篇 |
妇产科学 | 31篇 |
基础医学 | 237篇 |
口腔科学 | 55篇 |
临床医学 | 177篇 |
内科学 | 450篇 |
皮肤病学 | 32篇 |
神经病学 | 62篇 |
特种医学 | 476篇 |
外科学 | 154篇 |
综合类 | 29篇 |
预防医学 | 92篇 |
眼科学 | 17篇 |
药学 | 84篇 |
中国医学 | 4篇 |
肿瘤学 | 120篇 |
出版年
2021年 | 18篇 |
2020年 | 11篇 |
2019年 | 10篇 |
2018年 | 27篇 |
2017年 | 12篇 |
2016年 | 29篇 |
2015年 | 37篇 |
2014年 | 42篇 |
2013年 | 68篇 |
2012年 | 49篇 |
2011年 | 44篇 |
2010年 | 92篇 |
2009年 | 69篇 |
2008年 | 59篇 |
2007年 | 65篇 |
2006年 | 47篇 |
2005年 | 47篇 |
2004年 | 40篇 |
2003年 | 29篇 |
2002年 | 33篇 |
2001年 | 26篇 |
2000年 | 30篇 |
1999年 | 31篇 |
1998年 | 138篇 |
1997年 | 123篇 |
1996年 | 127篇 |
1995年 | 91篇 |
1994年 | 76篇 |
1993年 | 84篇 |
1992年 | 26篇 |
1991年 | 27篇 |
1990年 | 19篇 |
1989年 | 63篇 |
1988年 | 48篇 |
1987年 | 53篇 |
1986年 | 49篇 |
1985年 | 50篇 |
1984年 | 28篇 |
1983年 | 34篇 |
1982年 | 34篇 |
1981年 | 21篇 |
1980年 | 36篇 |
1979年 | 20篇 |
1978年 | 19篇 |
1977年 | 18篇 |
1976年 | 24篇 |
1975年 | 24篇 |
1971年 | 4篇 |
1966年 | 4篇 |
1965年 | 4篇 |
排序方式: 共有2175条查询结果,搜索用时 15 毫秒
1.
JA HYEON KU CHEOL KWAK SEUNG-JUNE OH EUNSIK LEE SANG EUN LEE JAE-SEUNG PAICK 《International journal of urology》2004,11(7):489-493
BACKGROUND: Our aims in the present study were to estimate the influences of pain and urinary symptoms on quality of life, and to determine which of these two variables has the most predictive power with respect to quality of life in young men with chronic prostatitis-like symptoms. METHODS: Chronic prostatitis-like symptoms were measured by the National Institutes of Health-Chronic Prostatitis Symptom Index. Of the 28,841 men aged 20 years who lived in the study community, 18,495 men (a response rate 64.1%) agreed to participate in the study. A total of 1057 men who complained of symptoms indicative of chronic prostatitis were included in the study. The influences of pain and urinary symptoms on quality of life were determined using logistic regression analysis. The receiver operating characteristic (ROC) curve was used to estimate the predictive ability of each of these variables with respect to quality of life. RESULTS: Results from multivariate analysis showed that both pain and urinary symptoms were associated with an increased likelihood of impaired quality of life, although pain contributed more to a reduced quality of life than urinary symptoms. Relative to men who experienced mild pain, men who experienced moderate pain had a 3.9-fold risk of poor quality of life (odds ratio [OR], 3.87; 95% confidence interval [CI], 2.86-5.23; P < 0.001) and those who experienced severe pain had a 15.7-fold risk of reduced quality of life (OR, 15.68; 95% CI, 6.59-37.35; P < 0.001). Moderate urinary symptoms were associated with a 1.4-fold risk of bother (OR, 1.41; 95% CI, 1.01-1.99; P < 0.001) and severe urinary symptoms were associated with 2.4-fold risk (OR, 2.39; 95% CI, 1.37-4.12; P < 0.001), relative to mild urinary symptoms. Comparison of the effects of pain and urinary symptoms showed that pain severity had the most predictive power for bother, quality of life, and quality-of-life impact. The areas under the ROC curves for bother, quality of life, and quality-of-life impact were 71.3%, 69.3% and 72.5%, respectively. CONCLUSION: Urinary symptoms and pain might be associated with an increased likelihood of impaired quality of life in young men with chronic prostatitis-like symptoms. In addition, our findings suggest that pain severity is the most influential variable for determining quality of life in this population. 相似文献
2.
3.
4.
5.
6.
7.
Summary Results of re-operations of 99 adult patients with recurrent supratentorial lobar glioblastomas (60 patients) and anaplastic
astrocytomas (39 patients) have been reviewed. In all cases both surgical interventions were performed at the same institute.
Age of patients with glioblastoma varied between 19 and 64 and with anaplastic astrocytoma between 21 and 68 years, with a
mean value of 48 and 36 years, respectively. The median interval between the first and second operations was 47 weeks for
patients with glioblastoma and 83 weeks with anaplastic astrocytoma. The mortality rate of the re-operations was 3%. Following
re-operation radio-and/or chemotherapy was applied in most of the cases. Median survival time after re-operation was 18.5
weeks in patients with glioblastoma and 55 weeks with anaplastic astrocytoma. Survival curves were calculated according to
Kaplan-Meier method and for statistical evaluation the generalized Wilcoxon test and multiple linear regression method were
used.
Histologically lower grade tumour at the first operation and longer interval between the two operations proved to influence
positively and differentiation of the primary tumour negatively the survival time. 相似文献
8.
9.
Short-Ti inversion-recovery pulse sequence: analysis and initial experience in cancer imaging 总被引:2,自引:0,他引:2
Inversion recovery (IR), commonly considered a pulse sequence capable of producing T1-weighted images with excellent display of normal anatomy, is versatile: The null point and peak time provide a useful, succinct summary of the properties of IR and its capacity for producing both T1- and T2-weighted images. Shortening of the inversion time (TI) and creation of a short-TI inversion-recovery (STIR) pulse sequence increases sensitivity to malignancy and other abnormalities by making the effects of prolonged T1 and T2 on signal intensity additive and by nulling the signal from fat. The authors examined over 300 patients with various malignancies and compared STIR images with T1- and T2-weighted images obtained at 0.5 T. In 43 cases, signal-difference-to-noise ratios (SD/Ns) were calculated between tumor, fat, and muscle. In general, STIR images demonstrated tumor as a conspicuously high-intensity area in a background of muted, discernible anatomic detail. The good contrast achieved with STIR sequences between tumor and fat (SD/N = 18.1) and tumor and muscle (SD/N = 12.9) consolidated into a single image the information contained separately on T1- and T2-weighted images, which facilitates efficient detection and localization of malignancy. 相似文献
10.