全文获取类型
收费全文 | 56705篇 |
免费 | 2863篇 |
国内免费 | 281篇 |
专业分类
耳鼻咽喉 | 676篇 |
儿科学 | 1138篇 |
妇产科学 | 651篇 |
基础医学 | 7353篇 |
口腔科学 | 1502篇 |
临床医学 | 3739篇 |
内科学 | 13591篇 |
皮肤病学 | 1290篇 |
神经病学 | 4942篇 |
特种医学 | 2676篇 |
外国民族医学 | 1篇 |
外科学 | 9176篇 |
综合类 | 241篇 |
一般理论 | 6篇 |
预防医学 | 1609篇 |
眼科学 | 1294篇 |
药学 | 3614篇 |
中国医学 | 107篇 |
肿瘤学 | 6243篇 |
出版年
2023年 | 299篇 |
2022年 | 591篇 |
2021年 | 1011篇 |
2020年 | 569篇 |
2019年 | 752篇 |
2018年 | 1020篇 |
2017年 | 823篇 |
2016年 | 1031篇 |
2015年 | 1020篇 |
2014年 | 1411篇 |
2013年 | 1672篇 |
2012年 | 2794篇 |
2011年 | 3003篇 |
2010年 | 1754篇 |
2009年 | 1537篇 |
2008年 | 2685篇 |
2007年 | 3054篇 |
2006年 | 2894篇 |
2005年 | 2970篇 |
2004年 | 3010篇 |
2003年 | 2948篇 |
2002年 | 2868篇 |
2001年 | 1577篇 |
2000年 | 1640篇 |
1999年 | 1576篇 |
1998年 | 837篇 |
1997年 | 683篇 |
1996年 | 648篇 |
1995年 | 549篇 |
1994年 | 522篇 |
1993年 | 474篇 |
1992年 | 1153篇 |
1991年 | 984篇 |
1990年 | 935篇 |
1989年 | 909篇 |
1988年 | 871篇 |
1987年 | 844篇 |
1986年 | 762篇 |
1985年 | 714篇 |
1984年 | 525篇 |
1983年 | 418篇 |
1982年 | 215篇 |
1981年 | 204篇 |
1979年 | 351篇 |
1978年 | 245篇 |
1977年 | 223篇 |
1974年 | 214篇 |
1972年 | 188篇 |
1971年 | 198篇 |
1969年 | 190篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
Hori Hiroki Ohta Asuka Matsui Honami Yano Kanako Morita-Tominaka Miyuki Linn Zayar Masumoto Daisuke Okumura Yosuke Okamura Satoshi Kurihara Kosuke Hayakawa Akira Rikiishi Takeshi Kobayashi Kyoko 《International journal of clinical oncology / Japan Society of Clinical Oncology》2022,27(1):245-252
International Journal of Clinical Oncology - The practice of cancer diagnosis disclosure to children has been changed with the times. The regulations of clinical trials in the 2000s might change... 相似文献
2.
3.
4.
Toshihiro Yoshitake Akira Takeda Kensaku Ohki Yuko Inoue Takanori Yamawaki Saori Otsuka Minekatsu Akimoto Mitsuru Nemoto Yasuhito Shimakura Akio Sato 《The Journal of dermatology》2015,42(7):735-738
Finasteride is standard medical treatment for androgenetic alopecia; however, no large studies with 5 years or more of follow up have been performed in Japan. The authors followed Japanese men with androgenetic alopecia treated with finasteride for 5 years to evaluate long‐term treatment efficacy. Of 903 men treated with finasteride (1 mg/day), 801 patients were evaluated over 5 years by modified global photographic assessment. Although the proportion of improvement was high (99.4%), modified global photographic assessment scores after 5 years of treatment were lower in patients with more advanced disease as measured by the modified Norwood–Hamilton scale. After separating patients into “sufficient” and “insufficient” efficacy groups according to the modified global photographic assessment score after 5 years (scores ≥6 and <6, respectively), multivariate analysis showed that independent risk factors of insufficient efficacy were age at start of treatment of 40 years or more (P = 0.021) and classification on the modified Norwood–Hamilton scale (P < 0.001), whereas presence of stress at start of treatment was a negative predictor (P = 0.025). In conclusion, continuous finasteride treatment for 5 years improved androgenetic alopecia with sustained effect among Japanese. Younger age and less advanced disease at start of treatment were the key predictors of higher finasteride efficacy. 相似文献
5.
6.
Akira Mogi Toshiki Yajima Kenji Tomizawa Ryoichi Onozato Shigebumi Tanaka Hiroyuki Kuwano 《Annals of thoracic and cardiovascular surgery》2015,21(5):435-439
Purpose: Small pulmonary lesions that include ground-glass attenuation have been increasingly discovered because of progressive imaging diagnostic technologies. Despite the detection of such small lesions, sometimes it is quite difficult to localize them because of their size or considerable depth from the visceral pleura. In the present study, we examined the usefulness of computed tomography-guided lipiodol marking for thoracoscopic resection of impalpable pulmonary nodules.Methods: Fifty-six patients with an undiagnosed peripheral lesion(s) of the lung who had undergone preoperative computed tomography-guided lipiodol marking followed by video-assisted thoracoscopic surgery were studied.Results: All of the nodules were successfully marked by computed tomography-guided lipiodol marking, and all except for one case were localized by means of intraoperative fluoroscopy as clear spots. With regard to complications, pneumothorax occurred in 21 patients (37.5%), and only one patient required transient drainage. Although hemorrhaging in the lung parenchyma and hemosputum occurred in nine patients (16.1%) and one patient (1.8%), respectively, no patients were in serious condition. No intra- or postoperative mortality or morbidity was observed.Conclusion: Preoperative computed tomography-guided lipiodol marking of small or impalpable pulmonary nodules is a safe and useful procedure for thoracoscopic resection of the lung. 相似文献
7.
Masaru Sasaki Tsuyoshi Takahashi Soichiro Funaki Koji Tanaka Yasuhiro Miyazaki Naoko Ose Tomoki Makino Yukinori Kurokawa Makoto Yamasaki Kiyokazu Nakajima Yasushi Shintani Masaki Mori Yuichiro Doki 《Asian journal of endoscopic surgery》2021,14(1):116-119
We report a case of a diaphragmatic hernia after a heart transplant operation. A 43-year-old woman, who underwent orthotropic heart transplantation for hypertrophic cadiomyopathy two year earlier, presented with vomiting and epigastric pain. A computed tomography scan showed that the stomach and transverse colon were dislocated in the left thoracic cavity. We diagnosed left diaphragmatic hernia incarceration and performed laparoscopic repair of the diaphragmatic hernia. A 12 × 8 cm diaphragmatic defect was found intraoperatively on the ventrolateral aspect of the left diaphragm, and the stomach with volvulus had herniated into the thorax through the defect. The hernia was considered to be iatrogenic. The diaphragmatic defect was large, and the diaphragm was thinning. We closed the defect by mesh repair. Laparoscopic mesh repair of the diaphragmatic hernia could be performed safely and with minimal invasiveness. 相似文献
8.
Journal of Neurology - 相似文献
9.
10.
Maria C. Chammas Andre C. Oliveira Mario J. D´Ávilla Pedro H. Moraes Marcelo Straus Takahashi 《Ultrasound in medicine & biology》2019,45(1):50-55
We prospectively evaluated the effectiveness of contrast-enhanced ultrasonography (CEUS) for differentiation of benign versus malignant portal vein thrombosis (PVT). We studied a total of 43 patients with chronic liver disease, hepatocellular carcinoma-suggestive nodules and confirmed PVT, in whom the nature of the PVT was confirmed by follow-up imaging (US, computed tomography and/or magnetic resonance imaging) performed up to 6 mo after CEUS. PVT was assessed by US, Doppler US and CEUS with respect to vessel wall disruption and/or invasion, color Doppler vascularization, pulsed Doppler vascularization pattern and CEUS enhancement and vascularization pattern, and thrombi were classified as benign or malignant based on these findings. Follow-up studies revealed malignant PVT in 22 of the 43 patients (51%) and benign PVT in 21 patients (49%). CEUS findings were consistent with follow-up studies in 41 of the 43 patients (95%), with κ?=?0.903 (p < 0.0001), sensitivity?=?91% and specificity?=?100%, indicating that CEUS can be confidently used to differentiate benign from malignant portal vein thrombosis in the setting of chronic liver disease. 相似文献