全文获取类型
收费全文 | 44595篇 |
免费 | 3450篇 |
国内免费 | 69篇 |
专业分类
耳鼻咽喉 | 305篇 |
儿科学 | 1465篇 |
妇产科学 | 1240篇 |
基础医学 | 5952篇 |
口腔科学 | 543篇 |
临床医学 | 6451篇 |
内科学 | 8312篇 |
皮肤病学 | 737篇 |
神经病学 | 4384篇 |
特种医学 | 1264篇 |
外科学 | 4549篇 |
综合类 | 879篇 |
一般理论 | 79篇 |
预防医学 | 5313篇 |
眼科学 | 596篇 |
药学 | 2707篇 |
1篇 | |
中国医学 | 41篇 |
肿瘤学 | 3296篇 |
出版年
2023年 | 192篇 |
2022年 | 261篇 |
2021年 | 728篇 |
2020年 | 500篇 |
2019年 | 771篇 |
2018年 | 910篇 |
2017年 | 717篇 |
2016年 | 716篇 |
2015年 | 794篇 |
2014年 | 1214篇 |
2013年 | 1889篇 |
2012年 | 2707篇 |
2011年 | 2757篇 |
2010年 | 1520篇 |
2009年 | 1376篇 |
2008年 | 2581篇 |
2007年 | 2696篇 |
2006年 | 2688篇 |
2005年 | 2643篇 |
2004年 | 2586篇 |
2003年 | 2452篇 |
2002年 | 2208篇 |
2001年 | 851篇 |
2000年 | 837篇 |
1999年 | 857篇 |
1998年 | 558篇 |
1997年 | 425篇 |
1996年 | 430篇 |
1995年 | 407篇 |
1994年 | 365篇 |
1993年 | 350篇 |
1992年 | 582篇 |
1991年 | 553篇 |
1990年 | 497篇 |
1989年 | 464篇 |
1988年 | 434篇 |
1987年 | 468篇 |
1986年 | 437篇 |
1985年 | 447篇 |
1984年 | 405篇 |
1983年 | 364篇 |
1982年 | 293篇 |
1981年 | 279篇 |
1980年 | 243篇 |
1979年 | 298篇 |
1978年 | 262篇 |
1977年 | 200篇 |
1974年 | 208篇 |
1973年 | 182篇 |
1972年 | 179篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Nancy C. Lee 《Public health reports (Washington, D.C. : 1974)》2015,130(2):121-Apr;130(2):121
3.
4.
5.
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
6.
7.
Miguel A. Sanz Pau Montesinos Haesook T. Kim Guillermo J. Ruiz-Argüelles María S. Undurraga María R. Uriarte Lem Martínez Rafael H. Jacomo Homero Gutiérrez-Aguirre Raul A. M. Melo Rosane Bittencourt Ricardo Pasquini Katia Pagnano Evandro M. Fagundes Edo Vellenga Alexandra Holowiecka Ana J. González-Huerta Pascual Fernández Javier De la Serna Salut Brunet Elena De Lisa José González-Campos José M. Ribera Isabel Krsnik Arnold Ganser Nancy Berliner Raul C. Ribeiro Francesco Lo-Coco Bob L?wenberg Eduardo M. Rego 《Annals of hematology》2015,94(8):1347-1356
8.
Mhd Wasem Alsabbagh Dana Church Lisa Wenger John Papastergiou Lalitha Raman-Wilms Eric Schneider Nancy Waite 《Research in social & administrative pharmacy》2019,15(2):202-206
Background
One approach to boost influenza vaccination coverage has been to expand immunization authority. In 2012, the province of Ontario gave community pharmacists the authority to administer the influenza vaccine.Objective
This study investigates the perspectives of Ontario pharmacy patrons, who had not recently received this vaccine from a pharmacist, regarding this pharmacist service.Methods
A survey was administered in six Ontario community pharmacies to pharmacy patrons who had not received an influenza vaccination from a pharmacist during the previous year. The instrument included questions about influenza vaccination, and knowledge of and attitudes toward vaccines and pharmacist-administered immunization.Results
A total of 541 pharmacy patrons completed the survey (53.9% response rate). About one-third (30.5%) of respondents were not aware that pharmacists could give the influenza vaccine, with younger individuals being less likely to be aware (OR 0.48, 95% CI 0.29–0.77, p?<?0.05) and less likely to receive the vaccine annually (OR 0.28, 95% CI 0.19–0.42, p?<?0.05). Leading reasons respondents gave as to why they did not receive their influenza vaccine from a pharmacist included not wanting or feeling they needed to be immunized (41.6%) and being used to receiving the vaccine from a physician (16.5%). Concerns about the experience and training of pharmacists and lack of privacy in a community pharmacy were uncommon.Conclusion
Reduced awareness of the availability of pharmacist-provided influenza vaccine is still common. Pharmacists have a significant opportunity to address lack of awareness and vaccine hesitancy issues. They can promote this service to increase influenza vaccination rates among pharmacy patrons who do not utilize this professional service. 相似文献9.
Lorraine Greaves Nancy Poole Natalie Hemsing 《Journal of obstetric, gynecologic, and neonatal nursing : JOGNN / NAACOG》2019,48(1):90-98
Rates of smoking during pregnancy remain high in Canada, and cessation rates are low among women who are younger than 24 years and who are socially disadvantaged, that is, have few social and economic resources because of poverty, violence, or mental health issues. On the basis of findings from literature reviews and consultation with policy makers, we developed and operationalized four approaches that can be used by health care providers to tailor interventions for tobacco use in pregnancy. These four approaches are woman centered, trauma informed, harm reducing, and equitable. Public health initiatives that address smoking in young and socially disadvantaged women could be more sharply focused by shifting to such tailored approaches that are grounded in social justice aims, span pre- and postpregnancy periods, and can be used to address women’s social contexts and concerns. 相似文献
10.
We have carried out a prospective randomised, single blind clinical trial to investigate the effect of continuous passive motion on range of knee flexion, lack of extension, pain levels and analgesic use after total knee replacement surgery. 85 subjects were randomly allocated to control or study group. All subjects followed the existing rehabilitation protocol, which permits immediate active range of motion exercises and mobilisation with the study group using continuous passive motion for 1 h, twice a day. Outcome measures employed were range of motion, pain assessed on a visual analogue scale and analgesic use according to the WHO ladder. Blinded evaluation was carried out preoperatively, at time of discharge from hospital, 6 weeks, 6 and 12 months postoperation. No significant difference was observed between groups at all time intervals for each outcome variable using Wilcoxon Rank sum tests. The results substantiate previous findings that short duration continuous passive motion following total knee arthroplasty does not influence outcome of range of motion or reported pain. 相似文献