全文获取类型
收费全文 | 108035篇 |
免费 | 8776篇 |
国内免费 | 375篇 |
专业分类
耳鼻咽喉 | 1156篇 |
儿科学 | 2878篇 |
妇产科学 | 2590篇 |
基础医学 | 13640篇 |
口腔科学 | 2567篇 |
临床医学 | 11552篇 |
内科学 | 22813篇 |
皮肤病学 | 1483篇 |
神经病学 | 9831篇 |
特种医学 | 3840篇 |
外国民族医学 | 6篇 |
外科学 | 15901篇 |
综合类 | 1752篇 |
现状与发展 | 1篇 |
一般理论 | 137篇 |
预防医学 | 9548篇 |
眼科学 | 3013篇 |
药学 | 7487篇 |
2篇 | |
中国医学 | 192篇 |
肿瘤学 | 6797篇 |
出版年
2022年 | 570篇 |
2021年 | 1726篇 |
2020年 | 1028篇 |
2019年 | 1549篇 |
2018年 | 1871篇 |
2017年 | 1383篇 |
2016年 | 1516篇 |
2015年 | 1771篇 |
2014年 | 2626篇 |
2013年 | 4183篇 |
2012年 | 5663篇 |
2011年 | 6118篇 |
2010年 | 3451篇 |
2009年 | 3182篇 |
2008年 | 5791篇 |
2007年 | 6166篇 |
2006年 | 5897篇 |
2005年 | 5890篇 |
2004年 | 5567篇 |
2003年 | 5047篇 |
2002年 | 5048篇 |
2001年 | 2245篇 |
2000年 | 2166篇 |
1999年 | 2072篇 |
1998年 | 1254篇 |
1997年 | 1095篇 |
1996年 | 953篇 |
1995年 | 937篇 |
1994年 | 855篇 |
1993年 | 776篇 |
1992年 | 1677篇 |
1991年 | 1666篇 |
1990年 | 1504篇 |
1989年 | 1519篇 |
1988年 | 1288篇 |
1987年 | 1393篇 |
1986年 | 1300篇 |
1985年 | 1371篇 |
1984年 | 1185篇 |
1983年 | 1008篇 |
1982年 | 915篇 |
1981年 | 803篇 |
1980年 | 846篇 |
1979年 | 993篇 |
1978年 | 838篇 |
1977年 | 762篇 |
1976年 | 710篇 |
1975年 | 679篇 |
1974年 | 762篇 |
1973年 | 662篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Objective
The aim of the study was to estimate the effect of the state-based reinsurance programs through the section 1332 State Innovation Waivers on health insurance marketplace premiums and insurer participation.Data Source
2015 to 2022 Robert Wood Johnson Foundation Health Insurance Exchange Compare Datasets.Study Design
An event study difference-in-differences (DD) model separately for each year of implementation and a synthetic control method (SCM) are used to estimate year-by-year effects following program implementation.Data Collection/Extraction Methods
Not applicable.Principal Findings
Reinsurance programs were associated with a decline in premiums in the first year of implementation by 10%–13%, 5%–19%, and 11%–17% for bronze, silver, and gold plans (p < 0.05). There is a trend of sustained declines especially for states that implemented their programs in 2019 and 2020. The SCM analyses suggest some effect heterogeneity across states but also premium declines across most states. There is no evidence that reinsurance programs affected insurer participation.Conclusion
State-based reinsurance programs have the potential to improve the affordability of health insurance coverage. However, reinsurance programs do not appear to have had an effect on insurer participation, highlighting the need for policy makers to consider complementary strategies to encourage insurer participation. 相似文献2.
Rajendrababu Sharmila Puthuran George Varghese Alia Laxmi Ananya Uduman Mohammed Sithiq Wijesinghe Hiruni Kaushalya 《International ophthalmology》2022,42(8):2609-2618
International Ophthalmology - To investigate the efficacy and safety of non-valved Aurolab aqueous drainage implant (AADI) surgery combined with phacoemulsification in eyes with refractory glaucoma... 相似文献
3.
Alexander E. J. Trevatt David R. Thomson Robert Miller Matthew Colquhoun Akinyemi I. Idowu Shakeel Rahman 《Journal of plastic surgery and hand surgery》2019,53(2):97-104
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia. 相似文献
4.
5.
6.
7.
8.
9.
William G. Breen Krishan R. Jethwa Nathan Y. Yu Grant M. Spears William S. Harmsen Robert C. Miller Jonathan B. Ashman William G. Rule Terence T. Sio Michelle A. Neben-Wittich Michael G. Haddock Amit Mahipal Mark J. Truty Christopher L. Hallemeier Kenneth W. Merrell 《Practical radiation oncology》2021,11(1):e63-e69
PurposeOur purpose was to determine the effect of chemoradiotherapy (CRT) on patient-reported quality of life (QOL) for patients with intact pancreas cancer.Methods and MaterialsWe reviewed a prospective QOL registry for patients with intact, clinically localized pancreatic ductal adenocarcinoma treated with CRT between June 2015 and November 2018. QOL was assessed pre-CRT (immediately before CRT, after neoadjuvant chemotherapy) and at the completion of CRT with the Functional Assessment of Cancer Therapy-Hepatobiliary (FACT-Hep) and its component parts: FACT-General (FACT-G) and hepatobiliary cancer subscore (HCS). A minimally important difference from pre-CRT was defined as ≥ 6, 5, and 8 points for FACT-G, HCS, and FACT-Hep, respectively.ResultsOf 157 patients who underwent CRT, 100 completed both pre- and post-CRT surveys and were included in the primary analysis. Median age at diagnosis was 65 years (range, 23-90). National Comprehensive Cancer Network resectability status was resectable (3%), borderline resectable (40%), or locally advanced (57%). Folinic acid, 5-fluorouracil, irinotecan, and oxaliplatin (FOLFIRINOX) (75%) or gemcitabine and nab-paclitaxel (42%) were given for a median of 6 cycles (range, 0-42) before CRT. Radiation therapy techniques included 3-dimensional conformal (22%), intensity modulated photon (55%), and intensity modulated proton (23%) radiation therapy to a median dose of 50 Gy (range, 36-62.5). Concurrent chemotherapy was most commonly capecitabine (82%). Sixty-three patients (63%) had surgery after CRT. The mean decline in FACT-G, HCS subscale, and FACT-Hep from pre- to post-CRT was 3.5 (standard deviation [SD], 13.7), 1.7 (SD 7.8), and 5.2 (SD 19.4), respectively. Each of these changes were statistically significant, but did not meet the minimally important difference threshold. Pancreatic head tumor location was associated with decline in FACT-Hep. Nausea was the toxicity with the greatest increase from pre- to post-CRT by both physician-assessment and patient-reported QOL.ConclusionsFor patients with intact pancreatic adenocarcinoma, modern CRT is well tolerated with minimal decline in QOL during treatment. 相似文献
10.