全文获取类型
收费全文 | 234969篇 |
免费 | 15306篇 |
国内免费 | 988篇 |
专业分类
耳鼻咽喉 | 2536篇 |
儿科学 | 5992篇 |
妇产科学 | 4431篇 |
基础医学 | 29320篇 |
口腔科学 | 4320篇 |
临床医学 | 24063篇 |
内科学 | 49592篇 |
皮肤病学 | 3229篇 |
神经病学 | 23674篇 |
特种医学 | 10115篇 |
外国民族医学 | 13篇 |
外科学 | 37099篇 |
综合类 | 2538篇 |
现状与发展 | 1篇 |
一般理论 | 177篇 |
预防医学 | 16525篇 |
眼科学 | 5529篇 |
药学 | 15510篇 |
1篇 | |
中国医学 | 324篇 |
肿瘤学 | 16274篇 |
出版年
2023年 | 1335篇 |
2022年 | 2190篇 |
2021年 | 5335篇 |
2020年 | 3043篇 |
2019年 | 5055篇 |
2018年 | 6054篇 |
2017年 | 4442篇 |
2016年 | 4855篇 |
2015年 | 5734篇 |
2014年 | 8355篇 |
2013年 | 11255篇 |
2012年 | 17284篇 |
2011年 | 18022篇 |
2010年 | 10076篇 |
2009年 | 9313篇 |
2008年 | 15870篇 |
2007年 | 16664篇 |
2006年 | 16205篇 |
2005年 | 16076篇 |
2004年 | 15111篇 |
2003年 | 13793篇 |
2002年 | 13192篇 |
2001年 | 1935篇 |
2000年 | 1446篇 |
1999年 | 2007篇 |
1998年 | 2784篇 |
1997年 | 2214篇 |
1996年 | 1924篇 |
1995年 | 1762篇 |
1994年 | 1526篇 |
1993年 | 1494篇 |
1992年 | 984篇 |
1991年 | 934篇 |
1990年 | 789篇 |
1989年 | 747篇 |
1988年 | 682篇 |
1987年 | 618篇 |
1986年 | 642篇 |
1985年 | 682篇 |
1984年 | 910篇 |
1983年 | 789篇 |
1982年 | 1036篇 |
1981年 | 968篇 |
1980年 | 841篇 |
1979年 | 468篇 |
1978年 | 518篇 |
1977年 | 447篇 |
1976年 | 419篇 |
1975年 | 316篇 |
1974年 | 310篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
161.
162.
163.
Michael Hermansson Anders Ekedahl Jonas Ranstam Thomas Zilling 《BMC gastroenterology》2009,9(1):25-13
Background
Despite a decreasing incidence of peptic ulcer disease, most previous studies report a stabile incidence of ulcer complications. We wanted to investigate the incidence of peptic ulcer complications in Sweden before and after the introduction of the proton pump inhibitors (PPI) in 1988 and compare these data to the sales of non-steroid anti-inflammatory drugs (NSAID) and acetylsalicylic acid (ASA). 相似文献164.
165.
166.
167.
Introduction
Although ependymoma is the third most common pediatric brain tumor, we know little about the genetic/epigenetic basis of its initiation, maintenance, or progression. This is due in part to the heterogeneity of the disease, as well as the small sample size of the cohorts analyzed in most studies. 相似文献168.
169.
Michael Bohnsack D.B. Saris J. Vanlauwe F. Almqvist J. Victor J. Bellemans R. Verdonk F.P. Luyten 《Sport》2009,25(2):137-138
170.
Timothy M. Pawlik Kelly Olino Ana Luiza Gleisner Michael Torbenson Richard Schulick Michael A. Choti 《Journal of gastrointestinal surgery》2007,11(7):860-868
Some investigators have suggested that preoperative chemotherapy for hepatic colorectal metastases may cause hepatic injury
and increase perioperative morbidity and mortality. The objective of the current study was to examine whether treatment with
preoperative chemotherapy was associated with hepatic injury of the nontumorous liver and whether such injury, if present,
was associated with increased morbidity or mortality after hepatic resection. Two-hundred and twelve eligible patients who
underwent hepatic resection for colorectal liver metastases between January 1999 and December 2005 were identified. Data on
demographics, clinicopathologic characteristics, and preoperative chemotherapy details were collected and analyzed. The majority
of patients received preoperative chemotherapy (n = 153; 72.2%). Chemotherapy consisted of fluoropyrimidine-based regimens: 5-FU monotherapy, 31.6%; irinotecan, 25.9%; and
oxaliplatin, 14.6%. Among those patients who received chemotherapy, the type of chemotherapy regimen predicted distinct patterns
of liver injury. Oxaliplatin was associated with increased likelihood of grade 3 sinusoidal dilatation (p = 0.017). Steatosis >30% was associated with irinotecan (27.3%) compared with no chemotherapy, 5-FU monotherapy, and oxaliplatin
(all p < 0.05). Irinotecan also was associated with steatohepatitis, as two of the three patients with steatohepatitis had received
irinotecan preoperatively. Overall, the perioperative complication rate was similar between the no-chemotherapy group (30.5%)
and the chemotherapy group (35.3%) (p = 0.79). Preoperative chemotherapy was also not associated with 60-day mortality. In patients with hepatic colorectal metastases,
preoperative chemotherapy is associated with hepatic injury in about 20 to 30% of patients. Furthermore, the type of hepatic
injury after preoperative chemotherapy was regimen-specific.
Presented at the American Hepato-Pancreato-Biliary Association 2006 Annual Meeting, March 11, Miami, Florida. 相似文献