全文获取类型
收费全文 | 1614642篇 |
免费 | 131943篇 |
国内免费 | 2701篇 |
专业分类
耳鼻咽喉 | 21915篇 |
儿科学 | 53149篇 |
妇产科学 | 46542篇 |
基础医学 | 229678篇 |
口腔科学 | 47571篇 |
临床医学 | 141942篇 |
内科学 | 317276篇 |
皮肤病学 | 34330篇 |
神经病学 | 131095篇 |
特种医学 | 65318篇 |
外国民族医学 | 474篇 |
外科学 | 245530篇 |
综合类 | 39850篇 |
现状与发展 | 3篇 |
一般理论 | 545篇 |
预防医学 | 123559篇 |
眼科学 | 36869篇 |
药学 | 122357篇 |
3篇 | |
中国医学 | 3141篇 |
肿瘤学 | 88139篇 |
出版年
2018年 | 15170篇 |
2016年 | 13268篇 |
2015年 | 15577篇 |
2014年 | 21259篇 |
2013年 | 32175篇 |
2012年 | 43752篇 |
2011年 | 45887篇 |
2010年 | 26980篇 |
2009年 | 25845篇 |
2008年 | 43748篇 |
2007年 | 45933篇 |
2006年 | 46722篇 |
2005年 | 45266篇 |
2004年 | 44610篇 |
2003年 | 42607篇 |
2002年 | 41675篇 |
2001年 | 75980篇 |
2000年 | 78596篇 |
1999年 | 66582篇 |
1998年 | 17807篇 |
1997年 | 16380篇 |
1996年 | 16348篇 |
1995年 | 16059篇 |
1994年 | 15101篇 |
1993年 | 14253篇 |
1992年 | 55525篇 |
1991年 | 53844篇 |
1990年 | 52623篇 |
1989年 | 50899篇 |
1988年 | 47271篇 |
1987年 | 46604篇 |
1986年 | 44327篇 |
1985年 | 42883篇 |
1984年 | 32055篇 |
1983年 | 27583篇 |
1982年 | 16157篇 |
1981年 | 14446篇 |
1980年 | 13576篇 |
1979年 | 30472篇 |
1978年 | 21077篇 |
1977年 | 17775篇 |
1976年 | 16703篇 |
1975年 | 17586篇 |
1974年 | 21499篇 |
1973年 | 20679篇 |
1972年 | 18860篇 |
1971年 | 17774篇 |
1970年 | 16294篇 |
1969年 | 15272篇 |
1968年 | 13953篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Turnbull Chris D. Stockley James A. Madathil Shyam Huq Syed S. A. Cooper Brendan G. Ali Asad Wharton Simon Stradling John R. Heitmar Rebekka 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》2022,260(7):2129-2139
Graefe's Archive for Clinical and Experimental Ophthalmology - Retinal microvascular endothelial dysfunction is thought to be of importance in the development of ocular vascular diseases.... 相似文献
72.
73.
O.R. Mitchell R. Dave J. Bekker P.A. Brennan 《The British journal of oral & maxillofacial surgery》2021,59(3):384-385
The first COVID-19 vaccination was given in December 2020 and there is an effort to vaccinate the international population on a massive scale. Common side effects from the vaccine include headache and tiredness. Regional lymphadenopathy has been described in relation to other vaccines. We describe two cases of supraclavicular reactive lymphadenopathy presenting in patients who had the COVID vaccination in the ipsilateral arm. Awareness of this diagnosis is important for patients presenting to the neck lump clinic. 相似文献
74.
75.
Yang Chih-Hsiang Wang Shirlene Wang Wei-Lin Belcher Britni R. Dunton Genevieve F. 《Journal of behavioral medicine》2022,45(5):702-715
Journal of Behavioral Medicine - Understanding associations between mothers’ and children’s physical activity and sedentary behavior on more fine-grained timescales can provide insights... 相似文献
76.
77.
Comparative outcomes of vascular access in patients older than 70 years with end-stage renal disease
Deokbi Hwang Sujin Park Hyung-Kee Kim Seung Huh 《Journal of vascular surgery》2019,69(4):1196-1206.e5
Objective
The advantage of arteriovenous fistulas (AVFs) in older patients requiring dialysis is controversial. We reviewed our vascular access experience in patients ≥70 years of age (older group) compared with younger patients.Methods
We analyzed consecutive patients who underwent access surgery between 2013 and 2016. Primary success (PS) and primary patency (PP) data were analyzed between the older and younger groups before and after propensity score matching of the patients' characteristics and access composition. PS was defined as the achievement of access function that was amenable to two sessions of successful cannulation without early occlusion or maturation failure requiring revision. PP was defined as the time with uninterrupted patency without intervention.Results
A total of 594 consecutive accesses were created among 563 patients, of whom 119 were allocated into each group after propensity score matching. In the whole cohort, 193 accesses (32.5%) were performed in older patients. AVFs were performed in 130 (67.4%) older patients and 293 (73.1%) younger patients. Regarding AVFs, the PS rate (83.6% in the older group vs 94.3% in the younger group; P = .001) and the overall PP at 6 and 12 months (73.1% and 57.1%, respectively, in the older group vs 86.7% and 77.7%, respectively, in the younger group; P = .009) were lower in the older group than in the younger group. However, no differences were found in the PS and PP rates for arteriovenous grafts between groups. Regarding the AVF location, the PS rate for forearm AVFs was significantly lower in the older group than in the younger group (76% vs 93%; P < .001); however, the PS rate of the upper arm was not different between the groups (94% vs 97%; P = .425). In the patients with PS, the PP rate of AVFs was similar between the two groups. In the older group with forearm AVFs, the median diameter of the radial artery was larger in the patients with PS than in the patients without PS (2.20 mm with PS vs 2.00 mm without PS; P = .008). The propensity score matching results demonstrated similar trends for the whole cohort, with lower PS (P = .042) and PP rates (P = .023) for AVF in the older group.Conclusions
The outcomes after AVF were poorer in the older group than in the younger group, which was primarily due to unsatisfactory outcomes in patients with forearm AVFs. Thus, stricter criteria, especially regarding the radial artery diameter, should be applied for forearm AVFs in older patients, and additional research is necessary to delineate the risk factors for primary failure. 相似文献78.
W. Do T. Elzerman R. de Bree A. Rosenberg T. Forouzanfar E.M. Van Cann 《International journal of oral and maxillofacial surgery》2021,50(5):591-597
The aim of this study was to analyse the effect of body mass index (BMI), both low and high values, on the perioperative complication rate in patients with oral squamous cell carcinoma (OSCC). The medical records of 259 patients operated between 2014 and 2017 for OSCC were reviewed. Univariate and multivariate analyses were performed. Sixty of the 259 patients developed 87 complications. Low or high BMI was not associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade. Low BMI, American Society of Anesthesiologists score 2 and 3, a longer operating time, and increased blood loss were associated with a longer hospital stay. Low BMI was associated with a longer hospital stay. Neither low nor high BMI was associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade. 相似文献
79.
80.