全文获取类型
收费全文 | 202566篇 |
免费 | 2483篇 |
国内免费 | 79篇 |
专业分类
耳鼻咽喉 | 1533篇 |
儿科学 | 7225篇 |
妇产科学 | 3694篇 |
基础医学 | 21374篇 |
口腔科学 | 2119篇 |
临床医学 | 14860篇 |
内科学 | 35867篇 |
皮肤病学 | 1193篇 |
神经病学 | 19078篇 |
特种医学 | 10263篇 |
外国民族医学 | 2篇 |
外科学 | 32826篇 |
综合类 | 2480篇 |
一般理论 | 4篇 |
预防医学 | 19392篇 |
眼科学 | 3514篇 |
药学 | 11296篇 |
中国医学 | 691篇 |
肿瘤学 | 17717篇 |
出版年
2022年 | 193篇 |
2021年 | 422篇 |
2020年 | 253篇 |
2019年 | 411篇 |
2018年 | 22348篇 |
2017年 | 17717篇 |
2016年 | 19904篇 |
2015年 | 1387篇 |
2014年 | 1507篇 |
2013年 | 1792篇 |
2012年 | 8306篇 |
2011年 | 22281篇 |
2010年 | 19666篇 |
2009年 | 12315篇 |
2008年 | 20744篇 |
2007年 | 23045篇 |
2006年 | 1988篇 |
2005年 | 3642篇 |
2004年 | 4619篇 |
2003年 | 5561篇 |
2002年 | 3722篇 |
2001年 | 680篇 |
2000年 | 800篇 |
1999年 | 555篇 |
1998年 | 541篇 |
1997年 | 452篇 |
1996年 | 314篇 |
1995年 | 331篇 |
1994年 | 300篇 |
1993年 | 241篇 |
1992年 | 282篇 |
1991年 | 319篇 |
1990年 | 346篇 |
1989年 | 267篇 |
1988年 | 225篇 |
1987年 | 196篇 |
1986年 | 178篇 |
1985年 | 196篇 |
1984年 | 186篇 |
1983年 | 155篇 |
1982年 | 186篇 |
1980年 | 140篇 |
1979年 | 138篇 |
1938年 | 156篇 |
1933年 | 179篇 |
1932年 | 208篇 |
1931年 | 141篇 |
1930年 | 201篇 |
1928年 | 138篇 |
1924年 | 139篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
5.
Gastroesophageal reflux is the most common benign disorder of the esophagus and laparoscopic Nissen fundoplication has become the standard surgical treatment for its treatment. In our area, where the use of bougie calibration is debatable, postoperative dysphagia is encountered often after this surgery although it is usually not permanent. The aim of this study was to investigate the effect of using a soft silicone tube 39 F in diameter for esophageal calibration during laparoscopic Nissen fundoplication on the incidence of postoperative dysphagia. We divided cases scheduled to undergo laparoscopic Nissen fundoplication between January 2009 and November 2010 into two groups, each consisting 25 patients. Esophageal calibration with a 39 F silicone orogastric tube was used for the first group while there was no operative calibration in the second group. The surgical duration was recorded; the presence and severity of the postoperative dysphagia was calculated by using a dysphagia severity scoring system during the 1-year postoperative follow-up. The dysphagia severity scores were significantly lower in group 1 than group 2 on the postoperative second day and at the end of the first week and first month. We did not find a significant difference at the end of the 6-month and first year. There was also no significant difference regarding surgery duration. The use of a soft orogastric tube 39 F in diameter for esophagus calibration during laparoscopic Nissen fundoplication has significantly decreased the incidence of postoperative transient dysphagia without affecting the duration of surgery. Although dysphagia gradually resolves in the majority of patients, a safe and easy calibration method for its prevention is worth developing, and we believe that the use of our method in larger series could be beneficial. 相似文献
6.
Daniel J. Snyder Thomas R. Kroshus Aakash Keswani Evan B. Garden Karl M. Koenig Kevin J. Bozic David S. Jevsevar Jashvant Poeran Calin S. Moucha 《The Journal of arthroplasty》2019,34(4):613-618
Background
Nursing Home Compare (NHC) ratings, created and maintained by Medicare, are used by both hospitals and consumers to aid in the skilled nursing facility (SNF) selection process. To date, no studies have linked NHC ratings to actual episode-based outcomes. The purpose of this study was to evaluate whether NHC ratings are valid predictors of 90-day complications, readmission, and bundle costs for patients discharged to an SNF after primary total joint arthroplasty (TJA).Methods
All SNF-discharged primary TJA cases in 2017 at a multihospital academic health system were queried. Demographic, psychosocial, and clinical variables were manually extracted from the health record. Medicare NHC ratings were then collected for each SNF. For patients in the Medicare bundle, postacute and total bundle cost was extracted from claims.Results
Four hundred eighty-eight patients were discharged to a total of 105 unique SNFs. In multivariate analysis, overall NHC rating was not predictive of 90-day readmission/major complications, >75th percentile postacute cost, or 90-day bundle cost exceeding the target price. SNF health inspection and quality measure ratings were also not predictive of 90-day readmission/major complications or bundle performance. A higher SNF staffing rating was independently associated with a decreased odds for >75th percentile 90-day postacute spend (odds ratio, 0.58; P = .01) and a 90-day bundle cost exceeding the target price (odds ratio = 0.69; P = .02) but was similarly not predictive of 90-day readmission/complications.Conclusion
Results of our study suggest that Medicare's NHC tool is not a useful predictor of 90-day costs, complications, or readmissions for SNFs within our health system. 相似文献7.
8.
9.
10.
Andreas Karatsaidis Olav Schreurs Kristen Helgeland Tony Axéll Karl Schenck 《Journal of oral pathology & medicine》2003,32(5):275-281
BACKGROUND: Common clinical forms of oral lichen planus (OLP) and oral lichenoid reactions (OLR) are erythematous (ERY) or reticular (RET). The purpose of this study was to find histopathological changes that differ between these forms. METHODS: Epithelial thickness, epithelial proliferation rate, apoptosis, and HLA-DR expression were compared among 10 reticular and 12 erythematous lesions, and 11 normal oral mucosa samples (NOM). RESULTS: The epithelium in ERY was thinner than in NOM, whereas RET showed values between ERY and NOM. Cell proliferation increased significantly in ERY as compared with RET and NOM, with no difference between RET and NOM. Relative numbers of epithelial cell nuclei displaying visible chromatin condensation were reduced in ERY form. CONCLUSIONS: The markedly increased cell proliferation in ERY supports the notion that this form displays a higher disease activity as compared to RET. It can therefore be important to study each disease form separately. 相似文献