全文获取类型
收费全文 | 2394396篇 |
免费 | 195854篇 |
国内免费 | 4301篇 |
专业分类
耳鼻咽喉 | 34382篇 |
儿科学 | 73064篇 |
妇产科学 | 63127篇 |
基础医学 | 337119篇 |
口腔科学 | 68070篇 |
临床医学 | 216799篇 |
内科学 | 473291篇 |
皮肤病学 | 48289篇 |
神经病学 | 202291篇 |
特种医学 | 96929篇 |
外国民族医学 | 886篇 |
外科学 | 363945篇 |
综合类 | 56309篇 |
现状与发展 | 1篇 |
一般理论 | 978篇 |
预防医学 | 191312篇 |
眼科学 | 55967篇 |
药学 | 178974篇 |
4篇 | |
中国医学 | 4389篇 |
肿瘤学 | 128425篇 |
出版年
2018年 | 24526篇 |
2016年 | 20895篇 |
2015年 | 23596篇 |
2014年 | 33924篇 |
2013年 | 51377篇 |
2012年 | 69609篇 |
2011年 | 73264篇 |
2010年 | 43035篇 |
2009年 | 41340篇 |
2008年 | 69635篇 |
2007年 | 74068篇 |
2006年 | 75002篇 |
2005年 | 72989篇 |
2004年 | 70274篇 |
2003年 | 67841篇 |
2002年 | 67104篇 |
2001年 | 113212篇 |
2000年 | 117304篇 |
1999年 | 98997篇 |
1998年 | 28128篇 |
1997年 | 25715篇 |
1996年 | 25656篇 |
1995年 | 24747篇 |
1994年 | 23294篇 |
1993年 | 21667篇 |
1992年 | 79842篇 |
1991年 | 76818篇 |
1990年 | 73978篇 |
1989年 | 71247篇 |
1988年 | 66202篇 |
1987年 | 65155篇 |
1986年 | 61699篇 |
1985年 | 58719篇 |
1984年 | 44406篇 |
1983年 | 37810篇 |
1982年 | 22965篇 |
1981年 | 20403篇 |
1980年 | 19085篇 |
1979年 | 41461篇 |
1978年 | 29088篇 |
1977年 | 24437篇 |
1976年 | 22893篇 |
1975年 | 24043篇 |
1974年 | 29713篇 |
1973年 | 28132篇 |
1972年 | 26307篇 |
1971年 | 24230篇 |
1970年 | 22857篇 |
1969年 | 21167篇 |
1968年 | 19213篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
This retrospective study aimed to evaluate radiation-induced pneumonitis (RIP) and a related condition that we define in this report—prolonged minimal RIP (pmRIP)—after stereotactic body radiotherapy (SBRT) for Stage I primary lung cancer in patients with chronic obstructive pulmonary disease (COPD). We assessed 136 Stage I lung cancer patients with COPD who underwent SBRT. Airflow limitation on spirometry was classified into four Global Initiative for Chronic Obstructive Lung Disease (GOLD) grades, with minor modifications: GOLD 1 (mild), GOLD 2 (moderate), GOLD 3 (severe) and GOLD 4 (very severe). On this basis, we defined two subgroups: COPD-free (COPD −) and COPD-positive (COPD +). There was no significant difference in overall survival or cause-specific–survival between these groups. Of the 136 patients, 44 (32%) had pmRIP. Multivariate analysis showed that COPD and the Brinkman index were statistically significant risk factors for the development of pmRIP. COPD and the Brinkman index were predictive factors for pmRIP, although our findings also indicate that SBRT can be tolerated in early lung cancer patients with COPD. 相似文献
8.
9.
10.
Anuj Shrestha Zeeshan Jawa Kathryn L. Koch Amy B. Rankin Qun Xiang Anand Padmanabhan Matthew S. Karafin Joshua J. Field 《Journal of clinical apheresis》2015,30(6):353-358
Red cell exchange (RCE) is a common procedure in adults with sickle cell disease (SCD). Implantable dual lumen Vortex (DLV) ports can be used for RCE in patients with poor peripheral venous access. We performed a retrospective cohort study of RCE procedures performed in adults with SCD. The main objective of the study was to compare the inlet speed, duration of procedures and rate of complications performed through DLV ports to those performed through temporary central venous and peripheral catheters. Twenty‐nine adults with SCD underwent a total of 318 RCE procedures. Twenty adults had DLV ports placed and 218 procedures were performed using DLV ports. Mean length of follow‐up after DLV port placement was 397 ± 263 days. Six DLV ports were removed due to infection and 1 for malfunction after a mean of 171 ± 120 days. Compared to temporary central venous and peripheral catheters, DLV port procedures had a greater rate of procedural complications, a longer duration, and a lower inlet speed (all P < 0.01). When accounting for the maximum allowable inlet speed to avoid citrate toxicity, 40% of DLV port procedures were greater than 10% below maximum speed, compared to 7 and 14% of procedures performed through temporary central venous and peripheral catheters (P < 0.0001). In conclusion, DLV ports can be used for RCE in adults with SCD, albeit with more procedural complications and longer duration. The smaller internal diameter and longer catheter of DLV ports compared to temporary central venous catheters likely accounts for the differences noted. J. Clin. Apheresis 30:353–358, 2015. © 2015 Wiley Periodicals, Inc. 相似文献