全文获取类型
收费全文 | 1251880篇 |
免费 | 94978篇 |
国内免费 | 1513篇 |
专业分类
耳鼻咽喉 | 16262篇 |
儿科学 | 40774篇 |
妇产科学 | 34861篇 |
基础医学 | 187551篇 |
口腔科学 | 34663篇 |
临床医学 | 116465篇 |
内科学 | 243913篇 |
皮肤病学 | 27243篇 |
神经病学 | 101003篇 |
特种医学 | 46677篇 |
外国民族医学 | 265篇 |
外科学 | 177777篇 |
综合类 | 25676篇 |
一般理论 | 568篇 |
预防医学 | 103472篇 |
眼科学 | 27940篇 |
药学 | 92071篇 |
6篇 | |
中国医学 | 1950篇 |
肿瘤学 | 69234篇 |
出版年
2018年 | 13382篇 |
2017年 | 10306篇 |
2016年 | 11181篇 |
2015年 | 12917篇 |
2014年 | 17920篇 |
2013年 | 27387篇 |
2012年 | 37525篇 |
2011年 | 39903篇 |
2010年 | 22961篇 |
2009年 | 22174篇 |
2008年 | 37701篇 |
2007年 | 40325篇 |
2006年 | 39912篇 |
2005年 | 39033篇 |
2004年 | 37496篇 |
2003年 | 35853篇 |
2002年 | 34767篇 |
2001年 | 55898篇 |
2000年 | 56879篇 |
1999年 | 47730篇 |
1998年 | 12443篇 |
1997年 | 11304篇 |
1996年 | 11709篇 |
1995年 | 11819篇 |
1994年 | 11026篇 |
1993年 | 10315篇 |
1992年 | 38132篇 |
1991年 | 37664篇 |
1990年 | 36426篇 |
1989年 | 35241篇 |
1988年 | 32655篇 |
1987年 | 32008篇 |
1986年 | 30506篇 |
1985年 | 28763篇 |
1984年 | 21903篇 |
1983年 | 19129篇 |
1982年 | 11302篇 |
1981年 | 10256篇 |
1979年 | 20878篇 |
1978年 | 15353篇 |
1977年 | 12706篇 |
1976年 | 11752篇 |
1975年 | 12743篇 |
1974年 | 15516篇 |
1973年 | 15297篇 |
1972年 | 14475篇 |
1971年 | 13516篇 |
1970年 | 12749篇 |
1969年 | 12033篇 |
1968年 | 11202篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Perkins Jessica M. Kakuhikire Bernard Baguma Charles Rasmussen Justin D. Satinsky Emily N. Kiconco Allen Kananura Justus Audet Carolyn M. Siedner Mark J. Haberer Jessica E. Bangsberg David R. Tsai Alexander C. 《AIDS and behavior》2022,26(6):1892-1904
AIDS and Behavior - Although misperceived norms often drive personal health behaviors, we do not know about this phenomenon in the context of antiretroviral therapy (ART) adherence. We conducted a... 相似文献
2.
Spindler L. Alam A. Fathallah N. Rentien A.-L. Draullette M. Pommaret E. Thierry M.-L. Mituialy A. El Abbes L. Aubert M. Benfredj P. Far E. Safa Beaussier H. de Parades V. 《Techniques in coloproctology》2022,26(2):143-146
Techniques in Coloproctology - The aim of our study was to assess the efficacy of sinus laser therapy (SiLaT) for the treatment of pilonidal disease. All adult patients treated with SiLaT in our... 相似文献
3.
Rhee Tae-Min Kim Hyung-Kwan Choi You-Jung Lee Hyun-Jung Hwang In-Chang Yoon Yeonyee E. Kim Hack-Lyoung Park Jun-Bean Lee Seung-Pyo Kim Yong-Jin Cho Goo-Yeong 《The international journal of cardiovascular imaging》2022,38(9):1939-1950
The International Journal of Cardiovascular Imaging - The new version of EchoPAC platform was recently developed by General Electronics (GE) to provide ‘vendor-independent’... 相似文献
4.
Sheeba M. Joseph Felix G.E. Dyrna Vivek Chadayammuri Taylor Wiley Elifho Obopilwe Bastian Scheiderer Knut Beitzel Mark P. Cote Anthony A. Romeo Augustus D. Mazzocca 《Seminars in Arthroplasty》2022,32(1):116-124
BackgroundReverse total shoulder arthroplasty (RSA) primarily varies between 2 implant design options: a 135 humeral stem inclination that closely resembles anatomic orientation, versus the Grammont-style 155 humeral stem inclination that further medializes and distalizes the center of rotation (COR). The purpose of this study was to compare deltoid force, glenoid strain, and simulated glenohumeral range of motion (ROM) between RSA 135 and RSA 155 designs, with a series of standardized permutations of glenosphere offset and rotator cuff pathology.MethodsTwelve fresh-frozen cadaveric shoulder specimens were studied using a shoulder simulator. Native shoulder motion profiles for reproducible abduction range of motion were established using a customized testing device. Optical 3-dimensional tracking and pressure sensors were used to accurately record glenohumeral range of motion (ROM), deltoid force, and glenoid strain for RSA 135 and RSA 155 designs. For each cohort, all combinations of glenosphere offsets and rotator cuff tendon involvement were evaluated.ResultsThere was no significant difference in the overall abduction ROM between the 155 and the 135 humeral stem implants (P = .75). Resting abduction angle and maximum abduction angle were significantly greater with a 155 + STD (standard offset) construct than with a 135 + STD construct (P < .001 and P = .01, respectively). Both stem inclinations decreased combined deltoid force requirements as compared the native shoulder with a massive cuff tear. Effective glenoid strain did not vary significantly between 135 + STD and 155 + STD constructs (P = .66).ConclusionOverall, range of motion between the 135 and the 155 humeral stem inclinations was not significantly different. The cumulative deltoid force was lower in RSA shoulders when compared to native shoulders with massive rotator cuff tears, highlighting the utility of both implant designs. The Grammont-style 155 stem coupled with a 2.5 mm inferior offset glenosphere required less deltoid force to reach maximum abduction than did the more anatomic, lateralized 135 stem coupled with a 4 mm lateral offset glenosphere.Level of EvidenceBasic Science, Biomechanics Controlled Laboratory Study 相似文献
5.
Weller Julia M. Kruse Friedrich E. Tourtas Theofilos 《International ophthalmology》2022,42(6):1789-1798
International Ophthalmology - This study aimed to evaluate the clinical outcomes up to 10 years after Descemet membrane endothelial keratoplasty (DMEK). In this retrospective, consecutive,... 相似文献
6.
7.
Clinical Oral Investigations - To evaluate the effect of membrane occlusiveness and experimental diabetes on early and late healing following guided bone regeneration. A total of 30 Wistar rats... 相似文献
8.
Ashlee B. Vargason Clesson E. Turner Craig D. Shriver Rachel E. Ellsworth 《Genetics in medicine》2022,24(1):232-237
PurposeIdentification of women with hereditary forms of cancer allows for precision medicine approaches to improve survival. Non-Hispanic Black (NHB) women in the US general population are less likely to undergo genetic testing or utilize risk-reducing strategies. Whether these disparities exist within the equal-access US military healthcare system is not known.MethodsGenetic test information and surgical procedures were extracted for all NHB and Non-Hispanic Whites (NHW) with invasive breast cancer. National Comprehensive Cancer Network criteria from the year of diagnosis were assessed for all patients. Data were analyzed using chi-square analysis with P < .05 defining significance.ResultsNHB were significantly (P = .009) more likely to meet criteria for genetic testing compared to NHW, however, test uptake did not differ significantly between populations (P = .292). While 81% of both populations with BRCA1/2 pathogenic variants elected for double mastectomy, NHW were two times more likely to undergo risk-reducing bilateral salpingo-oophorectomy.ConclusionThese data demonstrate that when barriers, such as cost and lack of insurance, were removed, NHB were as willing to pursue testing as their NHW counterparts. Increasing the availability of testing and clinical management for NHB with hereditary forms of cancer may help reduce disparate survival seen in the US general population. 相似文献
9.
Thomas Behrens Calvin Ge Roel Vermeulen Benjamin Kendzia Ann Olsson Joachim Schüz Hans Kromhout Beate Pesch Susan Peters Lützen Portengen Per Gustavsson Dario Mirabelli Pascal Guénel Danièle Luce Dario Consonni Neil E. Caporaso Maria Teresa Landi John K. Field Stefan Karrasch Heinz-Erich Wichmann Jack Siemiatycki Marie-Elise Parent Lorenzo Richiardi Lorenzo Simonato Karl-Heinz Jöckel Wolfgang Ahrens Hermann Pohlabeln Guillermo Fernández-Tardón David Zaridze John R. McLaughlin Paul A. Demers Beata Świątkowska Jolanta Lissowska Tamás Pándics Eleonora Fabianova Dana Mates Vladimir Bencko Lenka Foretova Vladimír Janout Paolo Boffetta Bas Bueno-de-Mesquita Francesco Forastiere Kurt Straif Thomas Brüning 《International journal of cancer. Journal international du cancer》2023,152(4):645-660
There is limited evidence regarding the exposure-effect relationship between lung-cancer risk and hexavalent chromium (Cr(VI)) or nickel. We estimated lung-cancer risks in relation to quantitative indices of occupational exposure to Cr(VI) and nickel and their interaction with smoking habits. We pooled 14 case-control studies from Europe and Canada, including 16 901 lung-cancer cases and 20 965 control subjects. A measurement-based job-exposure-matrix estimated job-year-region specific exposure levels to Cr(VI) and nickel, which were linked to the subjects' occupational histories. Odds ratios (OR) and associated 95% confidence intervals (CI) were calculated by unconditional logistic regression, adjusting for study, age group, smoking habits and exposure to other occupational lung carcinogens. Due to their high correlation, we refrained from mutually adjusting for Cr(VI) and nickel independently. In men, ORs for the highest quartile of cumulative exposure to CR(VI) were 1.32 (95% CI 1.19-1.47) and 1.29 (95% CI 1.15-1.45) in relation to nickel. Analogous results among women were: 1.04 (95% CI 0.48-2.24) and 1.29 (95% CI 0.60-2.86), respectively. In men, excess lung-cancer risks due to occupational Cr(VI) and nickel exposure were also observed in each stratum of never, former and current smokers. Joint effects of Cr(VI) and nickel with smoking were in general greater than additive, but not different from multiplicative. In summary, relatively low cumulative levels of occupational exposure to Cr(VI) and nickel were associated with increased ORs for lung cancer, particularly in men. However, we cannot rule out a combined classical measurement and Berkson-type of error structure, which may cause differential bias of risk estimates. 相似文献
10.