全文获取类型
收费全文 | 317551篇 |
免费 | 23176篇 |
国内免费 | 1210篇 |
专业分类
耳鼻咽喉 | 3500篇 |
儿科学 | 8815篇 |
妇产科学 | 6246篇 |
基础医学 | 41225篇 |
口腔科学 | 6592篇 |
临床医学 | 31012篇 |
内科学 | 66529篇 |
皮肤病学 | 4161篇 |
神经病学 | 30727篇 |
特种医学 | 10453篇 |
外国民族医学 | 14篇 |
外科学 | 48734篇 |
综合类 | 4899篇 |
现状与发展 | 3篇 |
一般理论 | 439篇 |
预防医学 | 28466篇 |
眼科学 | 7445篇 |
药学 | 22293篇 |
2篇 | |
中国医学 | 629篇 |
肿瘤学 | 19753篇 |
出版年
2023年 | 1267篇 |
2022年 | 951篇 |
2021年 | 5059篇 |
2020年 | 3400篇 |
2019年 | 5592篇 |
2018年 | 6566篇 |
2017年 | 5085篇 |
2016年 | 5630篇 |
2015年 | 6583篇 |
2014年 | 9734篇 |
2013年 | 13999篇 |
2012年 | 20830篇 |
2011年 | 22618篇 |
2010年 | 12636篇 |
2009年 | 11566篇 |
2008年 | 20978篇 |
2007年 | 22225篇 |
2006年 | 21346篇 |
2005年 | 21782篇 |
2004年 | 20804篇 |
2003年 | 19313篇 |
2002年 | 18626篇 |
2001年 | 2918篇 |
2000年 | 2198篇 |
1999年 | 2919篇 |
1998年 | 3545篇 |
1997年 | 2918篇 |
1996年 | 2447篇 |
1995年 | 2739篇 |
1994年 | 2419篇 |
1993年 | 2312篇 |
1992年 | 1778篇 |
1991年 | 1704篇 |
1990年 | 1539篇 |
1989年 | 1411篇 |
1988年 | 1450篇 |
1987年 | 1442篇 |
1986年 | 1364篇 |
1985年 | 1533篇 |
1984年 | 1947篇 |
1983年 | 1895篇 |
1982年 | 2395篇 |
1981年 | 2142篇 |
1980年 | 1991篇 |
1979年 | 1119篇 |
1978年 | 1236篇 |
1977年 | 1207篇 |
1976年 | 1071篇 |
1975年 | 906篇 |
1974年 | 907篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
Brain Topography - Accurate cortical source localization of event-related potentials (ERPs) requires using realistic head models constructed from the participant’s structural magnetic... 相似文献
6.
Keith B. Diamond Ivan J. Golub Asad M. Ashraf Samuel J. Swiggett Paul V. Romeo Jack Choueka 《Seminars in Arthroplasty》2022,32(1):15-22
BackgroundWhile studies have demonstrated favorable outcomes in utilization of primary total shoulder arthroplasty (TSA) for the treatment of glenohumeral osteoarthritis (OA), adverse events such as infections can still occur. Periprosthetic joint infections (PJIs) are associated with worse outcomes and patient morbidity. The purpose of this study was to: (1) compare patient demographics amongst TSA patients with and without PJIs following primary TSA; and (2) identify patient-related risk factors for PJIs following primary TSA.MethodsPatients undergoing primary TSA for the treatment of glenohumeral OA were identified using the Mariner administrative claims database by CPT code 23,472. Laterality modifiers were utilized to ensure PJIs were developing in the correct laterality as those patients undergoing primary TSA. Inclusion for the study group consisted of patients who developed PJIs within 2-years after the index procedure, whereas patients who did not develop PJIs served as the comparison cohort. Primary outcomes analyzed included patient demographics and patient-related risk factors for PJIs following primary TSA. A stepwise backwards elimination multivariate binomial logistic regression analyses was performed to determine the odds (OR) of PJIs in patients undergoing primary TSA. A P value less than .05 was considered statistically significant.ResultsThe query yielded 15,396 patients who underwent primary TSA for glenohumeral OA, of which 191 patients developed PJIs and 15,205 did not develop PJIs. The study found statistically significant differences amongst patients who did and did not develop PJIs following primary TSA with respect to age, sex, and presence of comorbid conditions. Risk factors associated with developing PJIs following primary TSA included: pathologic weight loss (OR: 2.06, P < .0001), obesity (OR: 1.56, P = .0001), male sex (OR: 1.52, P = .007), and peripheral vascular disease (OR: 1.46, P = .022).ConclusionAs the number of primary TSAs for the treatment of glenohumeral OA increase worldwide, identifying modifiable risk-factors to reduce the incidence of infection is critical. The study found various modifiable and non-modifiable risk factors associated with developing PJIs following primary TSA. This study is valuable to orthopedists in order to identify and risk-stratify patients with regard to PJI in the setting of primary TSA for OA.Level of EvidenceLevel III; Case-Control Study 相似文献
7.
8.
Victoria L. Parker Matthew C. Winter John A. Tidy Barry W. Hancock Julia E. Palmer Naveed Sarwar Baljeet Kaur Katie McDonald Xianne Aguiar Kamaljit Singh Nick Unsworth Imran Jabbar Allan A. Pacey Robert F. Harrison Michael J. Seckl 《International journal of cancer. Journal international du cancer》2023,152(5):986-997
Gestational trophoblastic neoplasia (GTN) patients are treated according to the eight-variable International Federation of Gynaecology and Obstetrics (FIGO) scoring system, that aims to predict first-line single-agent chemotherapy resistance. FIGO is imperfect with one-third of low-risk patients developing disease resistance to first-line single-agent chemotherapy. We aimed to generate simplified models that improve upon FIGO. Logistic regression (LR) and multilayer perceptron (MLP) modelling (n = 4191) generated six models (M1-6). M1, all eight FIGO variables (scored data); M2, all eight FIGO variables (scored and raw data); M3, nonimaging variables (scored data); M4, nonimaging variables (scored and raw data); M5, imaging variables (scored data); and M6, pretreatment hCG (raw data) + imaging variables (scored data). Performance was compared to FIGO using true and false positive rates, positive and negative predictive values, diagnostic odds ratio, receiver operating characteristic (ROC) curves, Bland-Altman calibration plots, decision curve analysis and contingency tables. M1-6 were calibrated and outperformed FIGO on true positive rate and positive predictive value. Using LR and MLP, M1, M2 and M4 generated small improvements to the ROC curve and decision curve analysis. M3, M5 and M6 matched FIGO or performed less well. Compared to FIGO, most (excluding LR M4 and MLP M5) had significant discordance in patient classification (McNemar's test P < .05); 55-112 undertreated, 46-206 overtreated. Statistical modelling yielded only small gains over FIGO performance, arising through recategorisation of treatment-resistant patients, with a significant proportion of under/overtreatment as the available data have been used a priori to allocate primary chemotherapy. Streamlining FIGO should now be the focus. 相似文献
9.
Laurien J. Zeverijn Eleonora J. Looze Subotheni Thavaneswaran J. Maxime van Berge Henegouwen Robert J. Simes Louisa R. Hoes Katrin M. Sjoquist Hanneke van der Wijngaart Lucille Sebastian Birgit S. Geurts Chee K. Lee Gijsbrecht F. de Wit David Espinoza Paul Roepman Frank P. Lin Anne M. L. Jansen Wendy W. J. de Leng Vincent van der Noort Lindsay V. M. Leek Filip Y. F. L. de Vos Carla M. L. van Herpen Hans Gelderblom Henk M. W. Verheul David M. Thomas Emile E. Voest 《International journal of cancer. Journal international du cancer》2023,153(7):1413-1422
The Dutch Drug Rediscovery Protocol (DRUP) and the Australian Cancer Molecular Screening and Therapeutic (MoST) Program are similar nonrandomized, multidrug, pan-cancer trial platforms that aim to identify signals of clinical activity of molecularly matched targeted therapies or immunotherapies outside their approved indications. Here, we report results for advanced or metastatic cancer patients with tumors harboring cyclin D-CDK4/6 pathway alterations treated with CDK4/6 inhibitors palbociclib or ribociclib. We included adult patients that had therapy-refractory solid malignancies with the following alterations: amplifications of CDK4, CDK6, CCND1, CCND2 or CCND3, or complete loss of CDKN2A or SMARCA4. Within MoST, all patients were treated with palbociclib, whereas in DRUP, palbociclib and ribociclib were assigned to different cohorts (defined by tumor type and alteration). The primary endpoint for this combined analysis was clinical benefit, defined as confirmed objective response or stable disease ≥16 weeks. We treated 139 patients with a broad variety of tumor types; 116 with palbociclib and 23 with ribociclib. In 112 evaluable patients, the objective response rate was 0% and clinical benefit rate at 16 weeks was 15%. Median progression-free survival was 4 months (95% CI: 3-5 months), and median overall survival 5 months (95% CI: 4-6 months). In conclusion, only limited clinical activity of palbociclib and ribociclib monotherapy in patients with pretreated cancers harboring cyclin D-CDK4/6 pathway alterations was observed. Our findings indicate that monotherapy use of palbociclib or ribociclib is not recommended and that merging data of two similar precision oncology trials is feasible. 相似文献
10.
Ali Soroush Reza Malekzadeh Gholamreza Roshandel Masoud Khoshnia Hossein Poustchi Farin Kamangar Paul Brennan Paolo Boffetta Sanford M. Dawsey Christian C. Abnet Julian A. Abrams Arash Etemadi 《International journal of cancer. Journal international du cancer》2023,152(6):1137-1149
Prior studies have conflicting findings regarding the association between gastroesophageal reflux disease (GERD) and esophageal squamous cell carcinoma (ESCC). We examined this relationship in a prospective cohort in a region of high ESCC incidence. Baseline exposure data were collected from 50 045 individuals using in-person interviews at the time of cohort entry. Participants were followed until they developed cancer, died, or were lost to follow up. Participants with GERD symptoms were categorized into any GERD (heartburn or regurgitation), mixed symptoms, or heartburn alone. Multivariable Cox regression was used to assess the relationship between GERD symptom group and histologically confirmed ESCC. The model was adjusted for known risk factors for GERD and ESCC. 49 559 individuals were included in this study, of which 9005 had GERD symptoms. Over 13.0 years of median follow up, 290 individuals were diagnosed with ESCC. We found no association between any GERD and risk of ESCC (aHR 0.90, 95% CI: 0.66-1.24, P = .54). Similar findings were observed for the GERD symptom subtypes. Significant interactions between any GERD and sex (P = .013) as well as tobacco smoking (P = .028) were observed. In post-hoc analyses, GERD was associated with a decreased risk of ESCC in men (aHR 0.51, 95% CI: 0.27-0.98 P = .04) and in smokers (aHR 0.26, 95% CI: 0.08-0.83 P = .02). While there was little evidence for an overall association between GERD symptoms and ESCC risk, significant interactions with sex and smoking were observed. Men and smokers with GERD symptoms had a lower risk of ESCC development. 相似文献