全文获取类型
收费全文 | 1140篇 |
免费 | 68篇 |
国内免费 | 2篇 |
专业分类
耳鼻咽喉 | 23篇 |
儿科学 | 62篇 |
妇产科学 | 41篇 |
基础医学 | 137篇 |
口腔科学 | 13篇 |
临床医学 | 95篇 |
内科学 | 210篇 |
皮肤病学 | 24篇 |
神经病学 | 38篇 |
特种医学 | 142篇 |
外科学 | 23篇 |
综合类 | 19篇 |
预防医学 | 90篇 |
眼科学 | 21篇 |
药学 | 30篇 |
肿瘤学 | 242篇 |
出版年
2021年 | 8篇 |
2020年 | 3篇 |
2019年 | 7篇 |
2018年 | 17篇 |
2017年 | 9篇 |
2016年 | 13篇 |
2015年 | 20篇 |
2014年 | 28篇 |
2013年 | 29篇 |
2012年 | 40篇 |
2011年 | 34篇 |
2010年 | 39篇 |
2009年 | 35篇 |
2008年 | 37篇 |
2007年 | 39篇 |
2006年 | 44篇 |
2005年 | 29篇 |
2004年 | 32篇 |
2003年 | 22篇 |
2002年 | 25篇 |
2001年 | 24篇 |
2000年 | 29篇 |
1999年 | 21篇 |
1998年 | 45篇 |
1997年 | 53篇 |
1996年 | 52篇 |
1995年 | 40篇 |
1994年 | 22篇 |
1993年 | 28篇 |
1992年 | 19篇 |
1991年 | 32篇 |
1990年 | 21篇 |
1989年 | 39篇 |
1988年 | 37篇 |
1987年 | 37篇 |
1986年 | 36篇 |
1985年 | 24篇 |
1984年 | 12篇 |
1983年 | 14篇 |
1982年 | 11篇 |
1981年 | 16篇 |
1980年 | 12篇 |
1979年 | 7篇 |
1978年 | 12篇 |
1977年 | 9篇 |
1976年 | 7篇 |
1975年 | 11篇 |
1972年 | 3篇 |
1971年 | 5篇 |
1970年 | 4篇 |
排序方式: 共有1210条查询结果,搜索用时 31 毫秒
1.
Anton A. Semenistyy Elena A. Litvina EA Anna G. Fedotova Chukwuweike Gwam Andrey N. Mironov 《Injury》2019,50(2):515-520
Background
Intramedullary nailing is considered a “gold standard” for treatment of tibial shaft fractures. However, some types of fractures are typically considered as “difficult for nailing”. This group includes the periarticular fractures, fractures of both bones at the same level, comminuted and segmental fractures of the tibia. Fixator-assisted nailing (FAN) is an effective method treatment of these types of fractures. The main requirements for the ideal reduction device are an ease of its installation and an ability of multiplanar fracture reduction. Fixator-assisted nailing (FAN) with the use of two perpendicular to each other monolateral tubular frames perfectly meets these requirements. In this study we present this new surgical technique and the analysis of first 30 cases.Methods
A prospective analysis was conducted for 30 patients with “difficult for nailing” tibial fractures treated with fixator-assisted nailing in our institution between September 1st, 2017, and March 1st, 2018. The duration of surgery and its different stages, the time of fluoroscopy, difficulties encountered during surgery, were analyzed. Clinical and radiological methods were used to evaluated reduction quality.Results
In all 30 cases the acceptable reduction was achieved. The mean duration of the surgical procedure was 73.7?±?3?min. The mean duration of fluoroscopy 85.9?±?4.8?s. In 7 cases we faced with technical difficulties, which were successfully addressed.Conclusion
The described technique of FAN is an effective method for the treatment of “difficult for nailing” tibial fractures. Future multi-centered studies with a larger number of patients are needed to validate our results. 相似文献2.
Cancer risk after evaluation for infertility 总被引:3,自引:0,他引:3
L A Brinton L J Melton G D Malkasian A Bond R Hoover 《American journal of epidemiology》1989,129(4):712-722
To evaluate cancer risk by various causes of infertility, the authors conducted a retrospective cohort study among 2,335 women evaluated for infertility at the Mayo Clinic between 1935 and 1964. Most cancers occurred at expected frequencies, with the exception of cancers of the thyroid (standardized incidence ratio (SIR) = 2.6) and other endocrine glands (SIR = 6.7), although analyses were based on small numbers. Patients with progesterone deficiencies (31 per cent of the study subjects) had a 20 per cent higher cancer risk than did those with other causes of infertility, with excesses deriving primarily from cancers of the lung, cervix, ovary, and thyroid and from melanoma. Breast cancer risk, however, was not elevated in either patients with progesterone deficiencies (SIR = 0.9) or patients with other causes of infertility (SIR = 1.0). Examination of other parameters of infertility, including age at evaluation, type of infertility (primary vs. secondary), and years of attempted conception, showed no elevated risks of breast cancer in any subgroup. These results fail to support previous studies that have linked progesterone deficiencies among infertile women to elevated breast cancer risk. However, the data suggest a possible involvement of a progesterone deficiency in the etiology of other cancers, particularly thyroid cancer and melanoma. 相似文献
3.
4.
5.
6.
7.
8.
Solitary bronchioloalveolar carcinoma: CT criteria 总被引:14,自引:0,他引:14
Kuhlman JE; Fishman EK; Kuhajda FP; Meziane MM; Khouri NF; Zerhouni EA; Siegelman SS 《Radiology》1988,167(2):379-382
The computed tomographic (CT) scans of 30 patients with solitary bronchioloalveolar carcinoma were reviewed. Common features at CT included the peripheral or subpleural location of a pulmonary mass (25 cases), pseudocavitation (18 cases), heterogeneous attenuation (17 cases), irregular margins forming a star pattern (22 cases), and pleural tags (21 cases). Using these CT criteria, four independent observers attempted to identify cases of bronchioloalveolar carcinoma from a larger sample of lung cancers and benign lesions by categorizing a series of test cases into four probability categories. Although the bronchioloalveolar carcinomas were correctly ranked in the two highest probability categories 75% of the time (in 45 of 60 cases), there was considerable overlap with other lung lesions, particularly with adenocarcinoma and large cell undifferentiated carcinoma. However, even though the typical features of bronchioloalveolar carcinoma are not invariable or highly specific, they are characteristic enough to suggest the diagnosis. 相似文献
9.
10.