全文获取类型
收费全文 | 218597篇 |
免费 | 10840篇 |
国内免费 | 681篇 |
专业分类
耳鼻咽喉 | 3458篇 |
儿科学 | 6739篇 |
妇产科学 | 5442篇 |
基础医学 | 30202篇 |
口腔科学 | 7691篇 |
临床医学 | 14591篇 |
内科学 | 51466篇 |
皮肤病学 | 7231篇 |
神经病学 | 18323篇 |
特种医学 | 5145篇 |
外国民族医学 | 31篇 |
外科学 | 27170篇 |
综合类 | 1353篇 |
一般理论 | 56篇 |
预防医学 | 20825篇 |
眼科学 | 4422篇 |
药学 | 15492篇 |
中国医学 | 1063篇 |
肿瘤学 | 9418篇 |
出版年
2023年 | 1232篇 |
2022年 | 936篇 |
2021年 | 5143篇 |
2020年 | 2955篇 |
2019年 | 5275篇 |
2018年 | 7089篇 |
2017年 | 4426篇 |
2016年 | 4412篇 |
2015年 | 4822篇 |
2014年 | 6723篇 |
2013年 | 9596篇 |
2012年 | 14428篇 |
2011年 | 15345篇 |
2010年 | 8294篇 |
2009年 | 7011篇 |
2008年 | 12189篇 |
2007年 | 12775篇 |
2006年 | 12077篇 |
2005年 | 12039篇 |
2004年 | 10901篇 |
2003年 | 10211篇 |
2002年 | 9544篇 |
2001年 | 6498篇 |
2000年 | 6993篇 |
1999年 | 5675篇 |
1998年 | 1409篇 |
1997年 | 1069篇 |
1996年 | 937篇 |
1995年 | 938篇 |
1994年 | 767篇 |
1993年 | 673篇 |
1992年 | 2506篇 |
1991年 | 2279篇 |
1990年 | 2066篇 |
1989年 | 1785篇 |
1988年 | 1622篇 |
1987年 | 1523篇 |
1986年 | 1455篇 |
1985年 | 1302篇 |
1984年 | 954篇 |
1983年 | 844篇 |
1979年 | 893篇 |
1978年 | 627篇 |
1975年 | 637篇 |
1974年 | 753篇 |
1973年 | 770篇 |
1972年 | 673篇 |
1971年 | 682篇 |
1970年 | 643篇 |
1969年 | 653篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
Tiago Ribeiro Leal Larissa Chaves Morais de Lima rick Tssio Barbosa Neves Maria Jacinta Arêa Leo Lopes Araújo Arruda Matheus Frana Perazzo Saul Martins Paiva Júnia Maria Serra-Negra Fernanda de Morais Ferreira Ana Flvia Granville-Garcia 《International journal of paediatric dentistry / the British Paedodontic Society [and] the International Association of Dentistry for Children》2022,32(1):22-30
3.
Andreas Lundin Martin Annborn Ola Borgquist Joachim Düring Johan Undén Christian Rylander 《Acta anaesthesiologica Scandinavica》2023,67(5):655-662
Patients admitted to intensive care after cardiac arrest are at risk of circulatory shock and early mortality due to cardiovascular failure. The aim of this study was to evaluate the ability of the veno-arterial pCO2 difference (∆pCO2; central venous CO2 – arterial CO2) and lactate to predict early mortality in postcardiac arrest patients. This was a pre-planned prospective observational sub-study of the target temperature management 2 trial. The sub-study patients were included at five Swedish sites. Repeated measurements of ∆pCO2 and lactate were conducted at 4, 8, 12, 16, 24, 48, and 72 h after randomization. We assessed the association between each marker and 96-h mortality and their prognostic value for 96-h mortality. One hundred sixty-three patients were included in the analysis. Mortality at 96 h was 17%. During the initial 24 h, there was no difference in ∆pCO2 levels between 96-h survivors and non-survivors. ∆pCO2 measured at 4 h was associated with an increased risk of death within 96 h (adjusted odds ratio: 1.15; 95% confidence interval [CI]: 1.02–1.29; p = .018). Lactate levels were associated with poor outcome over multiple measurements. The area under the receiving operating curve to predict death within 96 h was 0.59 (95% CI: 0.48–0.74) and 0.82 (95% CI: 0.72–0.92) for ∆pCO2 and lactate, respectively. Our results do not support the use of ∆pCO2 to identify patients with early mortality in the postresuscitation phase. In contrast, non-survivors demonstrated higher lactate levels in the initial phase and lactate identified patients with early mortality with moderate accuracy. 相似文献
4.
Gevert Mayara Vitorino Soares Renata Wambier Letícia Maira Ribeiro Ana Elisa Avais Letícia Simeoni de Souza Juliana Feltrin Chibinski Ana Cláudia Rodrigues 《Clinical oral investigations》2022,26(10):5989-6002
Clinical Oral Investigations - This overview analyzed the quality of the systematic reviews (SRs) available on treatments for molar-incisor hypomineralization (MIH). Six electronic databases were... 相似文献
5.
6.
7.
Vilar-Compte Mireya Gaitán-Rossi Pablo Félix-Beltrán Lucía Bustamante Arturo V. 《Journal of immigrant and minority health / Center for Minority Public Health》2022,24(1):65-77
Journal of Immigrant and Minority Health - COVID-19 has disproportionally affected underrepresented minorities (URM) and low-income immigrants in the United States. The aim of the study is to... 相似文献
8.
Traboulsi-Garet Bassel Jorba-García Adrià Camps-Font Octavi Alves Fabio Abreu Figueiredo Rui Valmaseda-Castellón Eduard 《Clinical oral investigations》2022,26(3):2371-2382
Clinical Oral Investigations - To determine the usefulness of Serum C-terminal telopeptide cross-link of type 1 collagen (sCTX) as a preoperative marker for predicting the risk of developing... 相似文献
9.
Zancanella Edilson do Prado Lucila Fernandes de Carvalho Luciane Bizari Machado Júnior Almiro J. Crespo Agrício Nubiato do Prado Gilmar Fernandes 《Sleep & breathing》2022,26(1):117-123
Sleep and Breathing - There are no studies comparing tests performed at home with those carried out in the laboratory, using the same device. The only studies that have been performed... 相似文献
10.
Juan Carlos Casado-Morente Elena Mora Rivas Carlos O’Connor Reina Soledad Angulo Serrano Estefanía Díaz-Fresno Isabel Sandoval-Menéndez Antonio Becerra M. Jesús Lucio Faustino Núñez-Batalla 《Acta otorrinolaringologica espanola》2021,72(1):21-26
ObjectiveThe aim of this study was to create and validate an abbreviated version of the Spanish Transsexual Voice Questionnaire for Male-to-Female Transsexuals (SvTVQMtF).SettingThe study was conducted by two referral hospitals for voice feminization surgery and by a university department of psychology and speech therapy, all in Spain.Subjects and methodsWe prospectively studied 51 male-to-female transsexuals who underwent voice feminization surgery between January 2017 and December 2018. The SvTVQMtF was completed before and after surgery, and the 10 items with the greatest variation were selected by clinical consensus of an expert panel to develop the short version of the SvTVQMtF (SvTVQMtF-10). The correlation between the total score and the score for each item on the SvTVQMtF and the SvTVQMtF-10 was studied. The internal consistency of the SvTVQMtF-10 was analysed.ResultsGood correlation (Pearson coefficient above .90) was found between the two questionnaires. A significant correlation was found between the total SvTVQMtF-10 score and the score for each item. A significant negative correlation was found between the SvTVQMtF and fundamental frequency after voice feminization surgery. Cronbach's α was .79.ConclusionThe SvTVQMtF-10 is a valid short version of the SvTVQMtF and can be used to quantify voice-related quality of life in MtF transsexuals. 相似文献