全文获取类型
收费全文 | 12874篇 |
免费 | 832篇 |
国内免费 | 47篇 |
专业分类
耳鼻咽喉 | 175篇 |
儿科学 | 343篇 |
妇产科学 | 268篇 |
基础医学 | 1933篇 |
口腔科学 | 1310篇 |
临床医学 | 995篇 |
内科学 | 2719篇 |
皮肤病学 | 280篇 |
神经病学 | 1065篇 |
特种医学 | 198篇 |
外科学 | 1358篇 |
综合类 | 50篇 |
一般理论 | 3篇 |
预防医学 | 1424篇 |
眼科学 | 192篇 |
药学 | 858篇 |
中国医学 | 95篇 |
肿瘤学 | 487篇 |
出版年
2023年 | 118篇 |
2022年 | 275篇 |
2021年 | 503篇 |
2020年 | 347篇 |
2019年 | 403篇 |
2018年 | 521篇 |
2017年 | 371篇 |
2016年 | 417篇 |
2015年 | 439篇 |
2014年 | 560篇 |
2013年 | 701篇 |
2012年 | 1042篇 |
2011年 | 1268篇 |
2010年 | 629篇 |
2009年 | 481篇 |
2008年 | 806篇 |
2007年 | 786篇 |
2006年 | 675篇 |
2005年 | 579篇 |
2004年 | 484篇 |
2003年 | 396篇 |
2002年 | 351篇 |
2001年 | 242篇 |
2000年 | 186篇 |
1999年 | 181篇 |
1998年 | 61篇 |
1997年 | 37篇 |
1996年 | 38篇 |
1995年 | 42篇 |
1994年 | 23篇 |
1993年 | 27篇 |
1992年 | 61篇 |
1991年 | 66篇 |
1990年 | 67篇 |
1989年 | 65篇 |
1988年 | 47篇 |
1987年 | 45篇 |
1986年 | 34篇 |
1985年 | 50篇 |
1984年 | 30篇 |
1983年 | 20篇 |
1979年 | 22篇 |
1978年 | 21篇 |
1975年 | 16篇 |
1974年 | 19篇 |
1973年 | 25篇 |
1970年 | 13篇 |
1969年 | 15篇 |
1967年 | 16篇 |
1966年 | 20篇 |
排序方式: 共有10000条查询结果,搜索用时 328 毫秒
1.
2.
Dermoscopic difficult lesions: an objective evaluation of reflectance confocal microscopy impact for accurate diagnosis 下载免费PDF全文
3.
4.
5.
6.
Caio Henrique de Carvalho Assuno Júlio Csar Trabanco Raquel Fornaziero Gomes Renata Rodrigues Moreira Alessandra Giannella Samelli 《La Medicina del lavoro》2019,110(4):304
Objective:The present study evaluates a training program for fitting different hearing protection devices (HPDs) based on personal attenuation rating (PAR) before, immediately after, and six months after training.Methods:A total of 67 workers from a public university in the city of São Paulo, Brazil, were invited to participate in the measurement of PARs for foam and silicone protectors through the 3M™ E-A-Rfit Validation System. Two evaluations were performed for each protector at each sampling date: one after reading printed material (the package instructions) and another after being trained by an audiologist. The same procedures were repeated after six months. The final sample consisted of 30 individuals. ANOVA was used for statistical analysis.Results:Larger PAR values were observed after training by the audiologist, and smaller values were observed after six months. Then, after re-training, the values increased again. There were no statistically significant differences in PAR among the HPDs tested. Even after the two training sessions, 23 to 27% of the subjects did not obtain adequate PAR values.Conclusion:These findings emphasize the need for continual worker training in the correct fit of earplug HPDs and the importance of longitudinal PAR monitoring. In addition, some workers, despite the training provided, did not adapt to the HPDs used. Therefore, it is essential that other protection methods and/or other HPD types are made available to these individuals.Key words: Hearing, noise-induced hearing loss, occupational health, personal protective equipment, hearing protection devices 相似文献
7.
Emma J. Walker Noni E. MacDonald Nehal Islam Nicole Le Saux Karina A. Top Deshayne B. Fell 《Vaccine》2019,37(13):1725-1735
Objective
To systematically review literature on uptake and timeliness of diphtheria-tetanus-pertussis, measles-mumps-rubella, and/or polio-containing vaccines in infants who were born preterm, with a low birth weight, and/or with chronic health conditions that were diagnosed within the first 6?months of life.Methods
Using a standardized search strategy developed by a medical librarian, records were extracted from MEDLINE, Embase, Database of Abstracts of Reviews of Effects, and CINAHL up to May 8, 2018.Results
Out of the 1997 records that were screened, we identified 21 studies that met inclusion criteria. Eleven studies assessed vaccine coverage and/or timeliness in preterm infants, 6 in low birth weight infants, and 7 in children with chronic health conditions. Estimates of coverage in these populations were highly variable, ranging from 40% to 100% across the vaccines and population groups.Conclusions
There is a lack of studies reporting coverage and timeliness of routine immunizations in special populations of children.Policy implications
Our review suggests a need for improved surveillance of immunization status in special populations of infants, as well as a need for standardization of reporting practices. 相似文献8.
Marcelo Sato‐Sano Solange Pistori Teixeira Juliano Cordova Vargas Otvio Cesar Carvalho Guimares Baiocchi Milvia Maria Simes e Silva Enokihara Elimar Elias Gomes Mariana Dias Batista 《The Journal of dermatology》2019,46(7):618-621
Eosinophilic dermatosis of hematological malignancy is a paraneoplastic skin eruption associated with chronic lymphocytic leukemia and other B‐cell malignancies. It clinically resembles an insect bite reaction and it can precede the symptoms of the hematological malignancy or be related to a more aggressive course. Different treatments have been proposed, but partial response and recurrence are frequent. Herein, we describe a case of eosinophilic dermatosis associated with mantle cell lymphoma with remission after lenalidomide therapy. 相似文献
9.
10.