全文获取类型
| 收费全文 | 955163篇 |
| 免费 | 69955篇 |
| 国内免费 | 3421篇 |
专业分类
| 耳鼻咽喉 | 13163篇 |
| 儿科学 | 24613篇 |
| 妇产科学 | 23592篇 |
| 基础医学 | 135978篇 |
| 口腔科学 | 28726篇 |
| 临床医学 | 83915篇 |
| 内科学 | 186915篇 |
| 皮肤病学 | 19407篇 |
| 神经病学 | 73604篇 |
| 特种医学 | 37738篇 |
| 外国民族医学 | 93篇 |
| 外科学 | 154661篇 |
| 综合类 | 22070篇 |
| 现状与发展 | 9篇 |
| 一般理论 | 238篇 |
| 预防医学 | 63267篇 |
| 眼科学 | 21891篇 |
| 药学 | 75255篇 |
| 18篇 | |
| 中国医学 | 3649篇 |
| 肿瘤学 | 59737篇 |
出版年
| 2021年 | 6935篇 |
| 2018年 | 9813篇 |
| 2017年 | 7879篇 |
| 2016年 | 8502篇 |
| 2015年 | 10000篇 |
| 2014年 | 13495篇 |
| 2013年 | 18725篇 |
| 2012年 | 25909篇 |
| 2011年 | 26945篇 |
| 2010年 | 16051篇 |
| 2009年 | 15225篇 |
| 2008年 | 25963篇 |
| 2007年 | 26996篇 |
| 2006年 | 27721篇 |
| 2005年 | 26791篇 |
| 2004年 | 25456篇 |
| 2003年 | 24488篇 |
| 2002年 | 23853篇 |
| 2001年 | 55265篇 |
| 2000年 | 57120篇 |
| 1999年 | 47563篇 |
| 1998年 | 11156篇 |
| 1997年 | 9837篇 |
| 1996年 | 9908篇 |
| 1995年 | 9234篇 |
| 1994年 | 8549篇 |
| 1993年 | 7771篇 |
| 1992年 | 35680篇 |
| 1991年 | 34068篇 |
| 1990年 | 32861篇 |
| 1989年 | 31963篇 |
| 1988年 | 29083篇 |
| 1987年 | 28315篇 |
| 1986年 | 26359篇 |
| 1985年 | 25187篇 |
| 1984年 | 17864篇 |
| 1983年 | 15166篇 |
| 1982年 | 7807篇 |
| 1979年 | 15791篇 |
| 1978年 | 10600篇 |
| 1977年 | 9056篇 |
| 1976年 | 7872篇 |
| 1975年 | 8630篇 |
| 1974年 | 10466篇 |
| 1973年 | 9859篇 |
| 1972年 | 9357篇 |
| 1971年 | 8852篇 |
| 1970年 | 8426篇 |
| 1969年 | 7923篇 |
| 1968年 | 7200篇 |
排序方式： 共有10000条查询结果，搜索用时 46 毫秒
81.
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
82.
83.
84.
85.
86.
Conall T. Morgan Brigitte Mueller Varsha Thakur Vitor Guerra Callaghan Jull Luc Mertens Mark Friedberg Fraser Golding Mike Seed Steven E.S. Miner Edgar T. Jaeggi Cedric Manlhiot Lynne E. Nield 《The Canadian journal of cardiology》2019,35(4):453-461
Background
The purpose of the study was to evaluate the association between fetal echocardiographic measurements and the need for intervention (primary coarctation repair, staged coarctation repair, or catheter intervention) in prenatally diagnosed coarctation of the aorta.Methods
A single-centre retrospective cohort study (2005-2015) of 107 fetuses diagnosed with suspected coarctation of the aorta in the setting of an apex-forming left ventricle and antegrade flow across the mitral and aortic valves.Results
Median gestational age at diagnosis was 32 weeks (interquartile range, 23-35 weeks). Fifty-six (52%) did not require any neonatal intervention, 51 patients (48%) underwent a biventricular repair. In univariable analysis, an increase in ascending aorta (AAo) peak Doppler flow velocity (odds ratio [OR], 1.40 [95% confidence interval [CI], 1.05-1.91] per 20 cm/s; P = 0.03) was associated with intervention. No intervention was associated with larger isthmus size (OR, 0.23; P < 0.001), transverse arch diameter (OR, 0.23; P < 0.001), and aortic (OR, 0.72; P = 0.02), mitral (OR, 0.58; P = 0.001), and AAo (OR, 0.53; P < 0.001) z-scores. In multivariable analysis, higher peak AAo Doppler (OR, 2.51 [95% CI, 1.54-4.58] per 20 cm/s; P = 0.001) and younger gestational age at diagnosis (OR, 0.81 [95% CI, 0.70-0.93] per week; P = 0.005) were associated with intervention, whereas a higher AAo z-score (OR, 0.65 [95% CI, 0.43-0.94] per z; P = 0.029) and transverse arch dimension (OR, 0.44 [95% CI, 0.18-0.97]; P = 0.05) decreased the risk of intervention.Conclusions
In prenatally suspected coarctation, the variables associated with intervention comprised smaller AAo and transverse arch size, earlier gestational age at diagnosis, and the additional finding of a higher peak AAo Doppler. 相似文献87.
Distinct genetic alterations and luminal molecular subtype in nested variant of urothelial carcinoma
88.
Julia Thornton Snider Jesse Sussell Mahlet Gizaw Tebeka Alicia Gonzalez Joshua T. Cohen Peter Neumann 《Value in health》2019,22(3):332-339
Background
Payers frequently rely on budget impact model (BIM) results to help determine drug coverage policy and its effect on their bottom line. It is unclear whether BIMs typically overestimate or underestimate real-world budget impact.Objective
We examined how different modeling assumptions influenced the results of 6 BIMs from the Institute for Clinical and Economic Review (ICER).Study Design
Retrospective analysis of pharmaceutical sales data.Methods
From ICER reports issued before 2016, we collected estimates of 3 BIM outputs: aggregate therapy cost (ie, cost to treat the patient population with a particular therapy), therapy uptake, and price. We compared these against real-world estimates that we generated using drug sales data. We considered 2 classes of BIM estimates: those forecasting future uptake of new agents, which assumed “unmanaged uptake,” and those describing the contemporaneous market state (ie, estimates of current, managed uptake and budget impact for compounds already on the market).Results
Differences between ICER's estimates and our own were largest for forecasted studies. Here, ICER's uptake estimates exceeded real-world estimates by factors ranging from 7.4 (sacubitril/valsartan) to 54 (hepatitis C treatments). The “unmanaged uptake” assumption (removed from ICER's approach in 2017) yields large deviations between BIM estimates and real-world consumption. Nevertheless, in some cases, ICER's BIMs that relied on current market estimates also deviated substantially from real-world sales data.Conclusions
This study highlights challenges with forecasting budget impact. In particular, assumptions about uptake and data source selection can greatly influence the accuracy of results. 相似文献89.
Eloise R. Galligan Lindsey Fix Sameera Husain Philip Zachariah Darrell J. Yamashiro Christine T. Lauren 《Journal of cutaneous pathology》2019,46(2):159-161
We report a case of disseminated Trichosporon asahii in a patient on systemic antifungal therapy who presented with multiple cutaneous nodules suggestive of fungal infection. Histologic features resembled neutrophilic eccrine hidradenitis but staining with periodic acid‐Schiff and Gomori methenamine silver confirmed the clinical diagnosis. This case highlights the importance of maintaining suspicion for trichosporonosis and contextualizing histologic findings within the underlying clinical picture. 相似文献
90.