全文获取类型
收费全文 | 38368篇 |
免费 | 3048篇 |
国内免费 | 81篇 |
专业分类
耳鼻咽喉 | 291篇 |
儿科学 | 1706篇 |
妇产科学 | 1185篇 |
基础医学 | 5185篇 |
口腔科学 | 401篇 |
临床医学 | 4655篇 |
内科学 | 7024篇 |
皮肤病学 | 681篇 |
神经病学 | 4515篇 |
特种医学 | 722篇 |
外科学 | 3710篇 |
综合类 | 353篇 |
现状与发展 | 1篇 |
一般理论 | 74篇 |
预防医学 | 5225篇 |
眼科学 | 596篇 |
药学 | 2526篇 |
中国医学 | 35篇 |
肿瘤学 | 2612篇 |
出版年
2024年 | 81篇 |
2023年 | 618篇 |
2022年 | 989篇 |
2021年 | 1951篇 |
2020年 | 1156篇 |
2019年 | 1674篇 |
2018年 | 1880篇 |
2017年 | 1271篇 |
2016年 | 1439篇 |
2015年 | 1494篇 |
2014年 | 1960篇 |
2013年 | 2461篇 |
2012年 | 3566篇 |
2011年 | 3448篇 |
2010年 | 1726篇 |
2009年 | 1483篇 |
2008年 | 2274篇 |
2007年 | 2365篇 |
2006年 | 1998篇 |
2005年 | 1832篇 |
2004年 | 1566篇 |
2003年 | 1293篇 |
2002年 | 1164篇 |
2001年 | 147篇 |
2000年 | 108篇 |
1999年 | 176篇 |
1998年 | 230篇 |
1997年 | 137篇 |
1996年 | 114篇 |
1995年 | 114篇 |
1994年 | 106篇 |
1993年 | 96篇 |
1992年 | 54篇 |
1991年 | 45篇 |
1990年 | 42篇 |
1989年 | 32篇 |
1988年 | 30篇 |
1987年 | 27篇 |
1986年 | 30篇 |
1985年 | 33篇 |
1984年 | 30篇 |
1983年 | 25篇 |
1982年 | 25篇 |
1981年 | 27篇 |
1980年 | 31篇 |
1979年 | 20篇 |
1978年 | 21篇 |
1977年 | 13篇 |
1975年 | 9篇 |
1972年 | 12篇 |
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
81.
Dunn Jennifer A. Hackney Jonathan J. Martin Rachelle A. Tietjens Donna Young Timothy Bourke John A. Snell Deborah L. Nunnerley Joanne L. Hall Andrew Derrett Sarah 《Journal of occupational rehabilitation》2021,31(4):730-743
Journal of Occupational Rehabilitation - Purpose Little is currently known about how early intervention vocational rehabilitation (EIVR) works for people with newly acquired neurological conditions... 相似文献
82.
83.
84.
Jonathan J. Hue Kavin Sugumar Sarah C. Markt Amr Mohamed J. Eva Selfridge David Bajor Luke D. Rothermel Jeffrey M. Hardacre John B. Ammori Jordan M. Winter Lee M. Ocuin 《Surgery》2021,169(2):233-239
BackgroundMost data on postoperative outcomes among patients with proximal extrahepatic cholangiocarcinoma are reported by single institutions. The purpose of this study was to analyze postoperative outcomes stratified by age and comorbidities.MethodsPatients with proximal extrahepatic cholangiocarcinoma who underwent a resection were identified in the National Cancer Database. Pathologic, postoperative, and survival outcomes were compared based on age and Charlson-Deyo comorbidity index.ResultsAmong the 1,579 patients, the average age was 66 years, and 9.4% of patients were older than 80 years. Most patients had a Charlson-Deyo score of 0 (72.4%), with the minority having scores of 1 (20.5%) or ≥2 (7.1%). Patients ≥80 years had a higher 90-day mortality rate compared with patients 65 to 79 and <65 years (21.3% vs 12.0% vs 7.4%, P < .001). Patients with a Charlson-Deyo score ≥2 had longer duration of stay, greater likelihood of requiring an unplanned readmission, and a higher 90-day mortality rate compared with patients with a lower comorbidity index. Median survival of patients <65, 65 to 79, and ≥80 years was 31, 24, and 17 months, respectively. A similar trend was seen with increasing Charlson-Deyo score (0: 27 months, 1: 25 months, ≥2: 20 months). On multivariable analysis, age ≥80 years (hazard ratio = 1.52, P = .01) and Charlson-Deyo score ≥2 (hazard ratio = 1.45, P = .01) were associated with poor survival.ConclusionIn patients with proximal extrahepatic cholangiocarcinoma, age ≥80 years and greater comorbidity index are associated with increased risk of 90-day mortality and poor overall survival. This suggests that resections in high-risk patient populations should be approached with caution. 相似文献
85.
Mohan Srivarshini Cherukupalli Walcott-Sapp Sarah Lee Minna K. Srour Marissa K. Kim Sungjin Amersi Farin F. Giuliano Armando E. Chung Alice P. 《Annals of surgical oncology》2021,28(11):5907-5917
Annals of Surgical Oncology - Biomarker changes in patients with residual disease (RD) after neoadjuvant systemic therapy (NAT) have unclear consequences. This study examined the prevalence of... 相似文献
86.
Calvillo Katherina Zabicki Blair Sarah L. Kuerer Henry M. 《Annals of surgical oncology》2021,28(10):5453-5455
Annals of Surgical Oncology - 相似文献
87.
88.
89.
Maria Ruden Christopher H. Olivares Mathew Q. Fakhoury Alicia Roston Patricia P. Vidal Courtney M.P. Hollowell Sarah P. Psutka 《Urologic oncology》2021,39(1):73.e19-73.e25
PurposeTo compare the clinical presentation, treatment receipt, and oncologic outcomes between human immunodeficiency virus-seropositive (HIV+) and seronegative (HIV?) men with prostate cancer (CaP) matched by age, clinical stage, and race.Materials and methodsA retrospective review of 3,135 men treated for CaP from 2000 to 2016 was performed. HIV+ patients (N = 46) were matched 1:2 to 3 to HIV? men (N = 137) by age, race, and clinical stage. Clinicopathologic features and primary treatment received were compared between cohorts. Associations between HIV status and progression-free, cancer-specific, and overall survival were compared by HIV status using the Kaplan-Meier method and Cox proportional hazards analysis.ResultsAfter matching, men with and without HIV were similar with respect initial prostate-specific antigen, Gleason Sum, and Eastern Cooperative Oncology Group (ECOG) performance status. Among HIV+ men, 67.4% had a history of acquired immune deficiency syndrome, and 91.3% were on highly active antiretroviral therapy at CaP diagnosis. Among men with localized disease, HIV+ men were more likely to receive radiation (59.5% vs. 44.8%) or no therapy (13.5% vs. 4.3%) and less likely to receive surgery (16.2% vs. 30.2%), or to initiate active surveillance (10.8% vs. 16.4%; P = 0.04 overall). There were no differences in rates of clinical progression, development of castration resistance, or CaP death by HIV status. However, HIV+ status was associated with inferior overall survival (hazard ratio 2.89, P = 0.04).ConclusionsWhile most HIV+ patients had a history of acquired immune deficiency syndrome; HIV was well controlled in the majority of patients at the time of CaP diagnosis. While oncologic outcomes were similar between HIV+ and HIV? men, significant differences in treatment selection were observed. Further research is necessary to understand differences in treatment election by HIV status and to define optimal CaP treatment selection in men with HIV. 相似文献