全文获取类型
收费全文 | 6221篇 |
免费 | 390篇 |
国内免费 | 119篇 |
专业分类
耳鼻咽喉 | 463篇 |
儿科学 | 184篇 |
妇产科学 | 49篇 |
基础医学 | 421篇 |
口腔科学 | 26篇 |
临床医学 | 833篇 |
内科学 | 1282篇 |
皮肤病学 | 9篇 |
神经病学 | 56篇 |
特种医学 | 200篇 |
外国民族医学 | 3篇 |
外科学 | 377篇 |
综合类 | 1185篇 |
预防医学 | 213篇 |
眼科学 | 53篇 |
药学 | 425篇 |
7篇 | |
中国医学 | 138篇 |
肿瘤学 | 806篇 |
出版年
2024年 | 13篇 |
2023年 | 73篇 |
2022年 | 167篇 |
2021年 | 202篇 |
2020年 | 161篇 |
2019年 | 160篇 |
2018年 | 174篇 |
2017年 | 191篇 |
2016年 | 221篇 |
2015年 | 235篇 |
2014年 | 445篇 |
2013年 | 368篇 |
2012年 | 418篇 |
2011年 | 435篇 |
2010年 | 342篇 |
2009年 | 323篇 |
2008年 | 341篇 |
2007年 | 367篇 |
2006年 | 284篇 |
2005年 | 250篇 |
2004年 | 220篇 |
2003年 | 166篇 |
2002年 | 144篇 |
2001年 | 124篇 |
2000年 | 113篇 |
1999年 | 111篇 |
1998年 | 78篇 |
1997年 | 85篇 |
1996年 | 70篇 |
1995年 | 66篇 |
1994年 | 59篇 |
1993年 | 52篇 |
1992年 | 39篇 |
1991年 | 21篇 |
1990年 | 27篇 |
1989年 | 23篇 |
1988年 | 27篇 |
1987年 | 34篇 |
1986年 | 13篇 |
1985年 | 15篇 |
1984年 | 23篇 |
1983年 | 7篇 |
1982年 | 15篇 |
1981年 | 8篇 |
1980年 | 5篇 |
1979年 | 6篇 |
1978年 | 3篇 |
1977年 | 2篇 |
1975年 | 2篇 |
1971年 | 1篇 |
排序方式: 共有6730条查询结果,搜索用时 15 毫秒
1.
2.
《Vaccine》2020,38(3):570-577
IntroductionPediatric pneumococcal pneumonia complicated by parapneumonic pleural effusion/empyema (PPE/PE) remains a major concern despite general immunization with pneumococcal conjugate vaccines (PCVs).MethodsIn a nationwide pediatric hospital surveillance study in Germany we identified 584 children <18 years of age with bacteriologically confirmed PPE/PE from October 2010 to June 2018. Streptococcus pneumoniae was identified by culture and/or PCR of blood samples and/or pleural fluid and serotyped.ResultsS. pneumoniae was identified in 256 of 584 (43.8%) children by culture (n = 122) and/or PCR (n = 207). The following pneumococcal serotypes were detected in 114 children: serotype 3 (42.1%), 1 (25.4%), 7F (12.3%), 19A (7.9%), other PCV13 serotypes (4.4%) and non-PCV13 serotypes (7.9%). Between October 2010 and June 2014 serotype 1 (38.1%) and serotype 3 (25.4%) were most prevalent, whereas between July 2014 and June 2018 serotype 3 (62.7%) and non-PCV13 serotypes (15.7%) were dominant. Compared to children with other pneumococcal serotypes, children with serotype 3 associated PPE/PE were younger (median 3.2 years [IQR 2.1–4.3 years] vs. median 5.6 years [IQR 3.8–8.2 years]; p < 0.001) and more frequently admitted to intensive care (43 [89.6%] vs. 48 [73.8%]; p = 0.04). Seventy-six of 114 (66.7%) children with pneumococcal PPE/PE had been vaccinated with pneumococcal vaccines. Thirty-nine of 76 (51.3%) had received a vaccine covering the serotype detected. Thirty of these 39 breakthrough cases were age-appropriately vaccinated with PCV13 and considered vaccine failures, including 26 children with serotype 3, three children with serotype 19A and one child with serotype 1.ConclusionFollowing the introduction of PCV13 in general childhood vaccination we observed a strong emergence of serotype 3 associated PPE/PE in the German pediatric population, including a considerable number of younger children with serotype 3 vaccine breakthrough cases and failures. Future PCVs should not only cover newly emerging serotypes, but also include a more effective component against serotype 3. 相似文献
3.
4.
《Revista brasileira de otorrinolaringologia (English ed.)》2022,88(5):803-811
ObjectivesTo review the evidence pertaining to the association between cow’s milk protein allergy and recurrent acute otitis media and otitis media with effusion.MethodsThe CENTRAL, Web of Science, EMBASE, MEDLINE, LILACS databases, and gray literature were searched.ResultsFour studies were included, identifying the prevalence rates: 0.2% of delayed speech due to chronic otitis media with effusion in 382 children with cow’s milk protein allergy, 10.7% of cow’s milk protein allergy in 242 children who underwent ENT procedures, 40% of cow’s milk protein allergy in 25 children with recurrent otitis media with effusion and higher tendency to otitis media in children with cow’s milk protein allergy of 186 children (1.5 + 0.6 vs. 0.4 + 0.1; p < 0.1).ConclusionConsidering the characteristics and methodological variations of the identified studies, it is not possible to state that there is reliable evidence of an association between cow’s milk protein allergy and otitis media. 相似文献
5.
Uday Yanamandra Prateek Deo Kamal Kant Sahu Ram Vasudevan Nampoothiri Nalini Gupta Anusree Prabhakaran Deb Prasad Dhibhar Alka Khadwal Gaurav Prakash Man Upadesh Singh Sachdeva Deepesh Lad Neelam Varma Subhash Varma Pankaj Malhotra 《Clinical Lymphoma, Myeloma & Leukemia》2019,19(3):183-189.e1
Background
Multiple myeloma (MM) is a hematologic malignancy of plasma cell origin. MM primarily affects bone marrow, but extramedullary sites can also be involved. Myelomatous pleural effusion (MPE) is an atypical and rare complication of MM. We aimed to systematically study the incidence and clinicopathologic profile of patients with MPE in a real-world setting.Patients and Methods
In this retrospective study, 415 consecutive patients with MM managed at a tertiary care center in North India during a study period of January 1, 2010 to December 31, 2015 were evaluated for MPE. The patients with MPE were analyzed for their clinical profile, diagnosis, treatment, and outcomes.Results
Of these 415 patients, 11 (2.65%) patients had MPE. The median age of the study population was 50 years with male preponderance. The majority of these patients had immunoglobin (Ig)G Kappa disease. All patients had higher than International Staging System stage I disease. MPE was a presenting feature at MM diagnosis in 45.45% (n = 5) of the patients, whereas the rest developed MPE during follow-up. MPE presented predominantly (81.8%) as a unilateral effusion. Concurrent extramedullary involvement at other site was seen in 45.45% (n = 5), with 3 (27%) patients having concurrent myelomatous ascites. Six of these were managed aggressively, whereas 5 patients opted for palliation. The outcomes were dismal (90.9% mortality), with a median survival of 2.47 months.Conclusion
MPE is a rare entity, and positive outcomes of therapy remain low with dismal prognosis. 相似文献6.
7.
8.
A number of masses and pseudomasses may be encountered during the echocardiographic examination of the transverse and oblique sinuses with significant clinical implications. This review discusses the clinically relevant anatomy of the pericardial sinuses emphasizing diagnostic pitfalls that may be encountered during their echocardiographic examination. 相似文献
9.
目的:评价CT诊断肺癌胸膜早期种植转移的价值,并分析漏诊原因。方法:回顾性分析43例经手术病理确诊肺癌胸膜种植转移的CT、手术病理资料,作对照研究。结果:43例中,术前CT仅诊断8例,其中Ⅲ级5例,Ⅱ级3例,诊断符合率19%(8/43),CT实际显示胸膜转移结节28例,其中Ⅰ级10例、Ⅱ级13例,Ⅲ级5例,未显示Ⅰ级15例,CT检出率为65%(28/43)。28例中,术前CT漏诊Ⅰ级和Ⅱ级各10例,漏诊率71%(20/28)。20例中,CT漏诊叶间胸膜、肺表面脏层胸膜、纵隔胸膜、肋胸膜、膈胸膜转移,漏诊率分别为0%、33%、36%、43%、80%。结论:CT能准确检出、诊断肺癌中晚期胸膜转移,但检出胸膜早期微小病灶有明显局限性,在CT诊断中,忽视对膈胸膜、肋胸膜、肺表面脏胸膜上Ⅰ、Ⅱ级较早转移灶的观察,是导致漏诊的原因之一。 相似文献
10.