全文获取类型
收费全文 | 13248篇 |
免费 | 726篇 |
国内免费 | 81篇 |
学科分类
医药卫生 | 14055篇 |
出版年
2023年 | 95篇 |
2022年 | 89篇 |
2021年 | 346篇 |
2020年 | 239篇 |
2019年 | 262篇 |
2018年 | 499篇 |
2017年 | 340篇 |
2016年 | 398篇 |
2015年 | 418篇 |
2014年 | 507篇 |
2013年 | 688篇 |
2012年 | 934篇 |
2011年 | 845篇 |
2010年 | 563篇 |
2009年 | 518篇 |
2008年 | 744篇 |
2007年 | 729篇 |
2006年 | 703篇 |
2005年 | 712篇 |
2004年 | 629篇 |
2003年 | 562篇 |
2002年 | 552篇 |
2001年 | 203篇 |
2000年 | 156篇 |
1999年 | 261篇 |
1998年 | 100篇 |
1997年 | 82篇 |
1996年 | 61篇 |
1995年 | 73篇 |
1994年 | 45篇 |
1993年 | 58篇 |
1992年 | 154篇 |
1991年 | 149篇 |
1990年 | 136篇 |
1989年 | 144篇 |
1988年 | 121篇 |
1987年 | 121篇 |
1986年 | 83篇 |
1985年 | 84篇 |
1984年 | 64篇 |
1983年 | 54篇 |
1982年 | 33篇 |
1981年 | 24篇 |
1980年 | 37篇 |
1979年 | 49篇 |
1978年 | 26篇 |
1976年 | 44篇 |
1973年 | 37篇 |
1972年 | 28篇 |
1971年 | 31篇 |
排序方式: 共有10000条查询结果,搜索用时 176 毫秒
1.
Martin R. Späth Malte P. Bartram Nicolàs Palacio-Escat K. Johanna R. Hoyer Cedric Debes Fatih Demir Christina B. Schroeter Amrei M. Mandel Franziska Grundmann Giuliano Ciarimboli Andreas Beyer Jayachandran N. Kizhakkedathu Susanne Brodesser Heike Göbel Jan U. Becker Thomas Benzing Bernhard Schermer Martin Höhne Markus M. Rinschen 《Kidney international》2019,95(2):333-349
2.
Borrelli Enrico Grosso Domenico Vella Giovanna Sacconi Riccardo Battista Marco Querques Lea Zucchiatti Ilaria Prascina Francesco Bandello Francesco Querques Giuseppe 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》2020,258(12):2621-2628
Graefe's Archive for Clinical and Experimental Ophthalmology - To estimate the impact of delayed care during the coronavirus disease 2019 (COVID-19) pandemic on the outcomes of patients with... 相似文献
3.
4.
5.
6.
7.
8.
Harinakshi Sanikini David C. Muller Marisa Sophiea Sabina Rinaldi Antonio Agudo Eric J. Duell Elisabete Weiderpass Kim Overvad Anne Tjønneland Jytte Halkjær Marie-Christine Boutron-Ruault Franck Carbonnel Iris Cervenka Heiner Boeing Rudolf Kaaks Tilman Kühn Antonia Trichopoulou Georgia Martimianaki Anna Karakatsani Valeria Pala Domenico Palli Amalia Mattiello Rosario Tumino Carlotta Sacerdote Guri Skeie Charlotta Rylander María-Dolores Chirlaque López Maria-Jose Sánchez Eva Ardanaz Sara Regnér Tanja Stocks Bas Bueno-de-Mesquita Roel C.H. Vermeulen Dagfinn Aune Tammy Y.N. Tong Nathalie Kliemann Neil Murphy Marc Chadeau-Hyam Marc J. Gunter Amanda J. Cross 《International journal of cancer. Journal international du cancer》2020,146(4):929-942
Obesity has been associated with upper gastrointestinal cancers; however, there are limited prospective data on associations by subtype/subsite. Obesity can impact hormonal factors, which have been hypothesized to play a role in these cancers. We investigated anthropometric and reproductive factors in relation to esophageal and gastric cancer by subtype and subsite for 476,160 participants from the European Prospective Investigation into Cancer and Nutrition cohort. Multivariable hazard ratios (HRs) and 95% confidence intervals (CIs) were estimated using Cox models. During a mean follow-up of 14 years, 220 esophageal adenocarcinomas (EA), 195 esophageal squamous cell carcinomas, 243 gastric cardia (GC) and 373 gastric noncardia (GNC) cancers were diagnosed. Body mass index (BMI) was associated with EA in men (BMI ≥30 vs. 18.5–25 kg/m2: HR = 1.94, 95% CI: 1.25–3.03) and women (HR = 2.66, 95% CI: 1.15–6.19); however, adjustment for waist-to-hip ratio (WHR) attenuated these associations. After mutual adjustment for BMI and HC, respectively, WHR and waist circumference (WC) were associated with EA in men (HR = 3.47, 95% CI: 1.99–6.06 for WHR >0.96 vs. <0.91; HR = 2.67, 95% CI: 1.52–4.72 for WC >98 vs. <90 cm) and women (HR = 4.40, 95% CI: 1.35–14.33 for WHR >0.82 vs. <0.76; HR = 5.67, 95% CI: 1.76–18.26 for WC >84 vs. <74 cm). WHR was also positively associated with GC in women, and WC was positively associated with GC in men. Inverse associations were observed between parity and EA (HR = 0.38, 95% CI: 0.14–0.99; >2 vs. 0) and age at first pregnancy and GNC (HR = 0.54, 95% CI: 0.32–0.91; >26 vs. <22 years); whereas bilateral ovariectomy was positively associated with GNC (HR = 1.87, 95% CI: 1.04–3.36). These findings support a role for hormonal pathways in upper gastrointestinal cancers. 相似文献
9.
10.