全文获取类型
收费全文 | 35584篇 |
免费 | 2140篇 |
国内免费 | 187篇 |
专业分类
耳鼻咽喉 | 421篇 |
儿科学 | 1132篇 |
妇产科学 | 996篇 |
基础医学 | 3617篇 |
口腔科学 | 1186篇 |
临床医学 | 2894篇 |
内科学 | 7516篇 |
皮肤病学 | 664篇 |
神经病学 | 2161篇 |
特种医学 | 1268篇 |
外国民族医学 | 4篇 |
外科学 | 6689篇 |
综合类 | 820篇 |
一般理论 | 27篇 |
预防医学 | 2355篇 |
眼科学 | 1325篇 |
药学 | 2793篇 |
1篇 | |
中国医学 | 258篇 |
肿瘤学 | 1784篇 |
出版年
2023年 | 357篇 |
2022年 | 310篇 |
2021年 | 1198篇 |
2020年 | 983篇 |
2019年 | 1235篇 |
2018年 | 1555篇 |
2017年 | 1111篇 |
2016年 | 1198篇 |
2015年 | 1327篇 |
2014年 | 1679篇 |
2013年 | 2046篇 |
2012年 | 3091篇 |
2011年 | 2990篇 |
2010年 | 1686篇 |
2009年 | 1460篇 |
2008年 | 2218篇 |
2007年 | 2289篇 |
2006年 | 2014篇 |
2005年 | 1782篇 |
2004年 | 1617篇 |
2003年 | 1343篇 |
2002年 | 1174篇 |
2001年 | 359篇 |
2000年 | 302篇 |
1999年 | 270篇 |
1998年 | 165篇 |
1997年 | 121篇 |
1996年 | 120篇 |
1995年 | 105篇 |
1994年 | 95篇 |
1993年 | 75篇 |
1992年 | 146篇 |
1991年 | 160篇 |
1990年 | 128篇 |
1989年 | 123篇 |
1988年 | 102篇 |
1987年 | 97篇 |
1986年 | 88篇 |
1985年 | 116篇 |
1984年 | 77篇 |
1983年 | 51篇 |
1982年 | 53篇 |
1981年 | 54篇 |
1980年 | 40篇 |
1979年 | 49篇 |
1978年 | 40篇 |
1977年 | 34篇 |
1975年 | 35篇 |
1974年 | 36篇 |
1973年 | 35篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
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
2.
Sami Akbulut Abdirahman Sakulen Hargura Ibrahim Umar Garzali Ali Aloun Cemil Colak 《World Journal of Clinical Cases》2022,10(26):9228-9240
Management of colorectal cancer (CRC) was severely affected by the changes implemented during the pandemic, and this resulted in delayed elective presentation, increased emergency presentation, reduced screening and delayed definitive therapy. This review was conducted to analyze the impact of the coronavirus disease 2019 (COVID-19) pandemic on management of CRC and to identify the changes made in order to adapt to the pandemic. We performed a literature search in PubMed, Medline, Index Medicus, EMBASE, SCOPUS, Reference Citation Analysis (https://www.referencecitationanalysis.com/) and Google Scholar using the following keywords in various combinations: Colorectal cancer, elective surgery, emergency surgery, stage upgrading, screening, surveillance and the COVID-19 pandemic. Only studies published in English were included. To curtail the spread of COVID-19 infection, there were modifications made in the management of CRC. Screening was limited to high risk individuals, and the screening tests of choice during the pandemic were fecal occult blood test, fecal immunochemical test and stool DNA testing. The use of capsule colonoscopy and open access colonoscopy was also encouraged. Blood-based tests like serum methylated septin 9 were also encouraged for screening of CRC during the pandemic. The presentation of CRC was also affected by the pandemic with more patients presenting with emergencies like obstruction and perforation. Stage migration was also observed during the pandemic with more patients presenting with more advanced tumors. The operative therapy of CRC was altered by the pandemic as more emergencies surgeries were done, which may require exteriorization by stoma. This was to reduce the morbidity associated with anastomosis and encourage early discharge from the hospital. There was also an initial reduction in laparoscopic surgical procedures due to the fear of aerosols and COVID-19 infection. As we gradually come out of the pandemic, we should remember the lessons learned and continue to apply them even after the pandemic passes. 相似文献
3.
4.
Mohammad Javad Alemzadeh‐Ansari Ali Sarreshtehdari Seifollah Abdi Jamal Moosavi Omid Shafe Parham Sadeghipour Hamidreza Pouraliakbar Bahram Mohebbi 《Seminars in dialysis》2021,34(1):89-93
A 70‐year‐old man with a history of coronary artery bypass grafting 15 years back and arteriovenous (AV) fistula creation in the left arm 1 month back presented with acute coronary syndrome (ACS). He had not received dialysis before his referral. We felt the most likely etiology for these complaints was increased cardiac oxygen demand from an increased cardiac output related to the newly formed left AV fistula. Coronary angiography was done to detect any significant stenosis in the native or grafted vessels. This revealed that the left subclavian artery was totally occluded in the ostioproximal segment and the coronary arteries did not have occlusions to explain the ACS setting. CT angiography confirmed the angiographic findings of the totally occluded left subclavian artery followed by a well‐developed and patent left internal mammary artery to left anterior descending artery. This led to the consideration of a steal syndrome from the coronary artery by the subclavian artery distal to the occlusion. A successful percutaneous endovascular intervention on the left subclavian artery occlusion was performed. Subsequently, the patient became asymptomatic and experienced a dramatic increase in left ventricular ejection fraction. 相似文献
5.
6.
7.
8.
Golfeshan Farzaneh Mosaddad Seyed Ali Babavalian Hamid Tebyanian Hamid Mehrjuyan Elnaz Shakeri Fatemeh 《Proceedings of the National Academy of Sciences, India. Section B.》2022,92(1):5-10
Proceedings of the National Academy of Sciences, India Section B: Biological Sciences - Regenerative medicine has been increased for helping crucial diseases and injuries. Planarians have appeared... 相似文献
9.
Al-kuraishy Hayder M. Al-Gareeb Ali I. Negm Walaa A. Alexiou Athanasios Batiha Gaber El-Saber 《Inflammopharmacology》2022,30(5):1493-1501
Inflammopharmacology - SARS-CoV-2 (severe acute respiratory syndrome coronavirus type 2) has been identified as the source of a world coronavirus pandemic in 2019. Covid-19 is considered a main... 相似文献
10.