全文获取类型
收费全文 | 8220篇 |
免费 | 381篇 |
国内免费 | 76篇 |
专业分类
耳鼻咽喉 | 73篇 |
儿科学 | 163篇 |
妇产科学 | 186篇 |
基础医学 | 886篇 |
口腔科学 | 148篇 |
临床医学 | 493篇 |
内科学 | 2147篇 |
皮肤病学 | 156篇 |
神经病学 | 473篇 |
特种医学 | 301篇 |
外科学 | 1735篇 |
综合类 | 22篇 |
一般理论 | 1篇 |
预防医学 | 196篇 |
眼科学 | 192篇 |
药学 | 397篇 |
中国医学 | 15篇 |
肿瘤学 | 1093篇 |
出版年
2024年 | 9篇 |
2023年 | 66篇 |
2022年 | 136篇 |
2021年 | 206篇 |
2020年 | 119篇 |
2019年 | 144篇 |
2018年 | 222篇 |
2017年 | 149篇 |
2016年 | 176篇 |
2015年 | 209篇 |
2014年 | 258篇 |
2013年 | 324篇 |
2012年 | 556篇 |
2011年 | 637篇 |
2010年 | 355篇 |
2009年 | 308篇 |
2008年 | 568篇 |
2007年 | 586篇 |
2006年 | 521篇 |
2005年 | 508篇 |
2004年 | 467篇 |
2003年 | 467篇 |
2002年 | 408篇 |
2001年 | 97篇 |
2000年 | 77篇 |
1999年 | 97篇 |
1998年 | 105篇 |
1997年 | 67篇 |
1996年 | 70篇 |
1995年 | 47篇 |
1994年 | 62篇 |
1993年 | 44篇 |
1992年 | 74篇 |
1991年 | 81篇 |
1990年 | 71篇 |
1989年 | 55篇 |
1988年 | 57篇 |
1987年 | 50篇 |
1986年 | 35篇 |
1985年 | 14篇 |
1984年 | 21篇 |
1983年 | 17篇 |
1982年 | 15篇 |
1981年 | 16篇 |
1979年 | 10篇 |
1978年 | 15篇 |
1977年 | 15篇 |
1975年 | 8篇 |
1974年 | 8篇 |
1968年 | 10篇 |
排序方式: 共有8677条查询结果,搜索用时 9 毫秒
91.
Kanto S Sugawara J Masuda H Sasano H Arai Y Kyono K 《Fertility and sterility》2008,90(5):2010.e5-2010.e7
92.
93.
94.
Hiroyuki Hisada Yoshiki Sakaguchi Kaori Oshio Satoru Mizutani Hideki Nakagawa Junichi Sato Dai Kubota Miho Obata Rina Cho Sayaka Nagao Yuko Miura Hiroya Mizutani Daisuke Ohki Seiichi Yakabi Yu Takahashi Naomi Kakushima Yosuke Tsuji Nobutake Yamamichi Mitsuhiro Fujishiro 《Current oncology (Toronto, Ont.)》2022,29(7):4678
Although the mortality rates of gastric cancer (GC) are gradually declining, gastric cancer is still the fourth leading cause of cancer-related death worldwide. This may be due to the high rate of patients who are diagnosed with GC at advanced stages. However, in countries such as Japan with endoscopic screening systems, more than half of GCs are discovered at an early stage, enabling endoscopic resection (ER). Especially after the introduction of endoscopic submucosal dissection (ESD) in Japan around 2000, a high en bloc resection rate allowing pathological assessment of margin and depth has become possible. While ER is a diagnostic method of treatment and may not always be curative, it is widely accepted as standard treatment because it is less invasive than surgery and can provide an accurate diagnosis for deciding whether additional surgery is necessary. The curability of ER is currently assessed by the completeness of primary tumor removal and the possibility of lymph node metastasis. This review introduces methods, indications, and curability criteria for ER of EGC. Despite recent advances, several problems remain unsolved. This review will also outline the latest evidence concerning future issues. 相似文献
95.
K Umeyama K Yoshikawa T Yamashita T Todo K Satake 《The British journal of surgery》1983,70(7):419-422
The results of transabdominal oesophageal transection in 101 patients with oesophageal varices are reported. The primary diagnosis was liver cirrhosis and 65 patients, idiopathic portal hypertension in 29 and extrahepatic portal obstruction in 7. Twelve patients died postoperatively. The mortality rate for emergency operations was higher than that for elective and prophylactic procedures. The majority of patients died from hepatic failure. Improvement, judged by radiographic and endoscopic examination, was 100 per cent and 96 per cent, respectively. Post-transection rebleeding was observed in 14 of 89 patients during the follow-up period of 1-13 years. There were 25 late deaths, caused mainly by hepatic failure. The 5-year survival rate, including postoperative deaths, was 72 per cent in idiopathic portal hypertension and 55 per cent in liver cirrhosis. We suggest that transabdominal oesophageal transection is an acceptable operative procedure for oesophageal varices. 相似文献
96.
Joji Mori Yutaka Kano Masahiro Yoshizaki Satoru Fukinbara 《Statistics in medicine》2013,32(29):5091-5105
Medical diagnostic tests must enjoy appropriate validity and high reliability in order to qualify as adequate assessment tools. Without a gold standard test, available medical diagnostic tests are not perfect; hence, the reliability of such tests must be evaluated precisely. Kappa coefficient statistics are often utilized to assess reliability of tests when there are two or more medical diagnostic tests. However, the statistics are imprecise for a typical case when the prevalence rate of a target disease is unknown. Although latent class models could be used to assess reliability, the models cannot estimate reliability in the case of two tests, due to unidentifiability or the lack of degrees of freedom. An alternative approach to assess reliability for the case of two tests is stratifying a two‐by‐two contingency table under the assumption that sensitivities and specificities between the two tests be equal over all strata and that prevalence rates in the strata be different from each other. Because stratification is basically a multi‐sample analysis, it should not be applied to the situation where subsamples (i.e., centers) are randomly selected from a larger population. In this article, a type of mixed‐effect model is proposed to evaluate the reliability of two tests for trials in randomly selected multiple centers. Several types of distributions for prevalence rates over subpopulations are considered. Simulation studies show that our proposed method performs nicely. Analysis of real data is also reported. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
97.
Tomohisa Furuya Satoru Sugimoto Chie Kurokawa Shuichi Ozawa Kumiko Karasawa Keisuke Sasai 《Journal of radiation research》2013,54(1):157-165
To evaluate the dosimetric impact of respiratory breast motion and daily setup error on whole breast irradiation (WBI) using three irradiation techniques; conventional wedge (CW), field-in-field (FIF) and irregular surface compensator (ISC). WBI was planned for 16 breast cancer patients. The dose indices for evaluated clinical target volume (CTVevl), lung, and body were evaluated. For the anterior-posterior (AP) respiratory motion and setup error of a single fraction, the isocenter was moved according to a sine function, and the dose indices were averaged over one period. Furthermore, the dose indices were weighted according to setup error frequencies that have a normal distribution to model systematic and random setup error for the entire treatment course. In all irradiation techniques, AP movement has a significant impact on dose distribution. CTVevlD95 (the minimum relative dose that covers 95 % volume) and V95 (the relative volume receiving 95 % of the prescribed dose) were observed to significantly decrease from the original ISC plan when simulated for the entire treatment course. In contrast, the D95, V95 and dose homogeneity index did not significantly differ from those of the original plans for FIF and CW. With regard to lung dose, the effect of motion was very similar among all three techniques. The dosimetric impact of AP respiratory breast motion and setup error was largest for the ISC technique, and the second greatest effect was observed with the FIF technique. However, these variations are relatively small. 相似文献
98.
99.
100.