全文获取类型
收费全文 | 524346篇 |
免费 | 33169篇 |
国内免费 | 3994篇 |
专业分类
耳鼻咽喉 | 7276篇 |
儿科学 | 10902篇 |
妇产科学 | 13356篇 |
基础医学 | 74490篇 |
口腔科学 | 14763篇 |
临床医学 | 44041篇 |
内科学 | 105895篇 |
皮肤病学 | 12344篇 |
神经病学 | 38144篇 |
特种医学 | 21086篇 |
外国民族医学 | 82篇 |
外科学 | 80002篇 |
综合类 | 11787篇 |
现状与发展 | 6篇 |
一般理论 | 136篇 |
预防医学 | 26512篇 |
眼科学 | 13377篇 |
药学 | 43489篇 |
1篇 | |
中国医学 | 3651篇 |
肿瘤学 | 40169篇 |
出版年
2022年 | 3848篇 |
2021年 | 7221篇 |
2020年 | 3971篇 |
2019年 | 6085篇 |
2018年 | 8558篇 |
2017年 | 6382篇 |
2016年 | 7440篇 |
2015年 | 9300篇 |
2014年 | 12156篇 |
2013年 | 15180篇 |
2012年 | 21859篇 |
2011年 | 21719篇 |
2010年 | 12973篇 |
2009年 | 11533篇 |
2008年 | 18029篇 |
2007年 | 18719篇 |
2006年 | 17919篇 |
2005年 | 16682篇 |
2004年 | 15305篇 |
2003年 | 14165篇 |
2002年 | 13099篇 |
2001年 | 30950篇 |
2000年 | 31326篇 |
1999年 | 25850篇 |
1998年 | 6258篇 |
1997年 | 5104篇 |
1996年 | 4635篇 |
1995年 | 4232篇 |
1994年 | 3754篇 |
1993年 | 3391篇 |
1992年 | 17258篇 |
1991年 | 16013篇 |
1990年 | 15210篇 |
1989年 | 14933篇 |
1988年 | 13497篇 |
1987年 | 12895篇 |
1986年 | 11929篇 |
1985年 | 11058篇 |
1984年 | 7457篇 |
1983年 | 6091篇 |
1982年 | 3085篇 |
1979年 | 5914篇 |
1978年 | 3695篇 |
1977年 | 3316篇 |
1975年 | 2899篇 |
1974年 | 3381篇 |
1973年 | 3148篇 |
1972年 | 3103篇 |
1971年 | 2973篇 |
1969年 | 2711篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Nevo N. Goldstein A. L. Staierman M. Eran N. Carmeli I. Rayman S. mnouskin Y. 《Hernia》2022,26(6):1491-1499
Hernia - The minimally invasive surgical repair of combined inguinal and ventral hernias often requires shifting from one approach or plane to another. The traditional enhanced-view totally... 相似文献
22.
Ho-Chul Jung Sung-Bin Chon Won Sup Oh Dong-Hyun Lee Ho-Jin Lee 《The American journal of tropical medicine and hygiene》2015,92(2):256-261
Scrub typhus usually presents as acute undifferentiated fever. This cross-sectional study included adult patients presenting with acute undifferentiated fever defined as any febrile illness for ≤ 14 days without evidence of localized infection. Scrub typhus cases were defined by an antibody titer of a ≥ fourfold increase in paired sera, a ≥ 1:160 in a single serum using indirect immunofluorescence assay, or a positive result of the immunochromatographic test. Multiple regression analysis identified predictors associated with scrub typhus to develop a prediction rule. Of 250 cases with known etiology of acute undifferentiated fever, influenza (28.0%), hepatitis A (25.2%), and scrub typhus (16.4%) were major causes. A prediction rule for identifying suspected cases of scrub typhus consisted of age ≥ 65 years (two points), recent fieldwork/outdoor activities (one point), onset of illness during an outbreak period (two points), myalgia (one point), and eschar (two points). The c statistic was 0.977 (95% confidence interval = 0.960–0.994). At a cutoff value ≥ 4, the sensitivity and specificity were 92.7% (79.0–98.1%) and 90.9% (86.0–94.3%), respectively. Scrub typhus, the third leading cause of acute undifferentiated fever in our region, can be identified early using the prediction rule. 相似文献
23.
Kun‐Yong Sung Seungkoo Lee Yeonjin Jeong Sang‐Yeul Lee 《The Australasian journal of dermatology》2021,62(1):60-63
A classic pilomatricoma, which usually presents with an asymptomatic, solitary, firm, subcutaneous nodule in the head, neck, or extremities of the paediatric population, is easily diagnosed based on its characteristic clinical and histopathological features. However, its variants often pose particular diagnostic challenges to clinicians due to their rarity and diverse clinicopathological features. We present a new pseudocystic variant, manifesting as solid lesions floating in a fluid‐filled sac. 相似文献
24.
Hyo-Kon Kim Sung-Han Ha Gi-Jun Lee Sun-O Yu Jung-Rae Kim 《Clinics in Orthopedic Surgery》2015,7(3):414-417
Synovial chondromatosis is a rare lesion in the wrist, but some cases in the distal radioulnar joint have been reported and previous case reports emphasize joint calcifications, shown on preoperative plain radiographs. We report an extremely uncommon case of synovial chondromatosis in the pisotriquetral joint, in which radiographs and magnetic resonance imaging did not demonstrate apparent calcified bodies. In our case, for the accurate diagnosis and treatment, surgical exploration of the joint and synovectomy with removal of loose bodies was performed. 相似文献
25.
26.
27.
In the 6th Basic Plan for Long-Term Electricity Supply and Demand (6th BPE) for Korea, for the first time, the environmental costs of air pollution caused by oxides of sulfur (SOx), oxides of nitrogen (NOx), and particulate matters (PM) from power plants were estimated and included. However, several deficiencies in evaluating the environmental costs were found. In this study, (1) the validity of the environmental costs used in the 6th BPE was assessed, (2) a systematic approach was suggested and used to improve the environmental costs estimation, and (3) the sensitivity of the cost of generating electricity to the environmental costs by fuel type with the proposed approach was discussed. We found that the applied environmental costs used in the 6th BPE did not fully include the demographic characteristics of Korea. By applying more realistic parameter values, it was found that the newly estimated environmental cost was about 23 times higher than the cost estimated in the original 6th BPE for coal-fired power plants and about 1.5 times higher for liquefied natural gas (LNG)-fired power plants, suggesting that LNG-fired power plants are more economical if using more realistic environmental costs. Thus, it is critical to check the validity of parameter values when calculating environmental costs. 相似文献
28.
Edward J. Holland Walter O. Whitley Kenneth Sall Stephen S. Lane Aparna Raychaudhuri Steven Y. Zhang 《Current medical research and opinion》2016,32(10):1759-1765
Objective: Report efficacy findings from three clinical trials (one phase 2 and two phase 3 [OPUS-1, OPUS-2]) of lifitegrast ophthalmic solution 5.0% for treatment of dry eye disease (DED).Research design and methods: Three 84-day, randomized, double-masked, placebo-controlled trials. Adults (≥18 years) with DED were randomized (1:1) to lifitegrast 5.0% or matching placebo. Changes from baseline to day 84 in signs and symptoms of DED were analyzed.Main outcome measures: Phase 2, pre-specified endpoint: inferior corneal staining score (ICSS; 0–4); OPUS-1, coprimary endpoints: ICSS and visual-related function subscale (0–4 scale); OPUS-2, coprimary endpoints: ICSS and eye dryness score (EDS, VAS; 0–100).Results: Fifty-eight participants were randomized to lifitegrast 5.0% and 58 to placebo in the phase 2 trial; 293 to lifitegrast and 295 to placebo in OPUS-1; 358 to lifitegrast and 360 to placebo in OPUS-2. In participants with mild-to-moderate baseline DED symptomatology, lifitegrast improved ICSS versus placebo in the phase 2 study (treatment effect, 0.35; 95% CI, 0.05–0.65; p?=?0.0209) and OPUS-1 (effect, 0.24; 95% CI, 0.10–0.38; p?=?0.0007). Among more symptomatic participants (baseline EDS ≥40, recent artificial tear use), lifitegrast improved EDS versus placebo in a post hoc analysis of OPUS-1 (effect, 13.34; 95% CI, 2.35–24.33; nominal p?=?0.0178) and in OPUS-2 (effect, 12.61; 95% CI, 8.51–16.70; p?<?0.0001).Limitations: Trials were conducted over 12 weeks; efficacy beyond this period was not assessed.Conclusions: Across three trials, lifitegrast improved ICSS in participants with mild-to-moderate baseline symptomatology in two studies, and EDS in participants with moderate-to-severe baseline symptomatology in two studies. Based on the overall findings from these trials, lifitegrast shows promise as a new treatment option for signs and symptoms of DED. 相似文献
29.