全文获取类型
收费全文 | 16440篇 |
免费 | 1128篇 |
国内免费 | 52篇 |
专业分类
耳鼻咽喉 | 200篇 |
儿科学 | 589篇 |
妇产科学 | 436篇 |
基础医学 | 2527篇 |
口腔科学 | 411篇 |
临床医学 | 1893篇 |
内科学 | 3312篇 |
皮肤病学 | 414篇 |
神经病学 | 1600篇 |
特种医学 | 440篇 |
外科学 | 1241篇 |
综合类 | 117篇 |
一般理论 | 4篇 |
预防医学 | 1447篇 |
眼科学 | 263篇 |
药学 | 1239篇 |
中国医学 | 25篇 |
肿瘤学 | 1462篇 |
出版年
2024年 | 15篇 |
2023年 | 147篇 |
2022年 | 341篇 |
2021年 | 565篇 |
2020年 | 364篇 |
2019年 | 469篇 |
2018年 | 475篇 |
2017年 | 399篇 |
2016年 | 464篇 |
2015年 | 551篇 |
2014年 | 685篇 |
2013年 | 929篇 |
2012年 | 1343篇 |
2011年 | 1320篇 |
2010年 | 771篇 |
2009年 | 661篇 |
2008年 | 1031篇 |
2007年 | 1124篇 |
2006年 | 1075篇 |
2005年 | 1007篇 |
2004年 | 945篇 |
2003年 | 836篇 |
2002年 | 755篇 |
2001年 | 125篇 |
2000年 | 73篇 |
1999年 | 101篇 |
1998年 | 157篇 |
1997年 | 136篇 |
1996年 | 87篇 |
1995年 | 87篇 |
1994年 | 69篇 |
1993年 | 67篇 |
1992年 | 43篇 |
1991年 | 42篇 |
1990年 | 24篇 |
1989年 | 29篇 |
1988年 | 29篇 |
1987年 | 23篇 |
1986年 | 15篇 |
1985年 | 18篇 |
1984年 | 24篇 |
1983年 | 27篇 |
1982年 | 18篇 |
1981年 | 17篇 |
1980年 | 21篇 |
1978年 | 14篇 |
1977年 | 22篇 |
1975年 | 11篇 |
1974年 | 10篇 |
1967年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
Jakub Pazdrowski Aleksandra Daczak‐Pazdrowska Adriana Polaska Joanna Ka
mierska Wojciech Barczak Mateusz Szewczyk Pawe Golusiski Zygmunt Adamski Ryszard aba Wojciech Golusiski 《Skin research and technology》2019,25(6):857-861
Radiodermatitis is one of the commonest side effects of radiotherapy. They are usually assessed by semi‐quantitative clinical scores, which are not validated and may be subject to inter‐observer variability. A few previous studies suggested that high‐frequency ultrasonography (HF‐USG) is useful in the assessment of the acute phase of radiation dermatitis in breast cancer patients. (a) To monitor skin changes by HF‐USG during the course of radiotherapy due to head and neck cancers, and (b) to determine whether there is any connection between skin sonograms and the skin scoring criteria. This prospective, observational study includes patients diagnosed with head and neck cancers, treated with radiotherapy or concomitant chemoradiation. The final analysis includes six patients. In every patient, the HF‐USG as well as dermatological assessment (target lesion score—TLS and CACE v. 4.0) were performed 4×: before, in the middle, day after, and 3 months after radiotherapy. There were significant differences between non‐irradiated skin thickness and thickness of skin with clinically obvious radiodermatitis (TLS grade 1‐4; P < .0001), as well as between irradiated, unchanged skin thickness (TLS grade 0) and thickness of skin with clinically obvious radiodermatitis (TLS grade 1‐4; P = .0002). There was no significant difference between non‐irradiated and irradiated, unchanged skin thickness (TLS grade 0; P = .9318). In four patients, we demonstrated subepidermal low echogenic band (SLEB). HF‐USG can be useful tool to noninvasive and objective assessment of skin changes during radiotherapy. 相似文献
4.
5.
6.
Christos Loizou Göran Laurell Andreas Arvidsson David Lindquist Karin Nylander Katarina Olofsson 《Acta oto-laryngologica》2015,135(10):1058-1064
Conclusion: Recurrent respiratory papillomatosis (RRP) patients with high surgical treatment frequency (≥ 1/year, HF) were significantly younger and had a more widespread laryngeal disease compared to a low frequency treated group (< 1 treatment/year, LF). This study confirms the existence of a clinical RRP group, not primarily related to HPV sub-type, but more care-intensive and in need of more vigilant follow-up. Objectives: RRP is associated with high morbidity due to its influence on breathing and voice. The purpose of this study was to characterize RRP patients in northern Sweden and investigate possible predictor factors affecting therapeutic needs. Method: Patients from the regional referral area (northern Sweden) were categorized for age, disease duration, juvenile or adult onset, profile of disease development, number of surgical sessions in relation to disease duration, laryngeal deposition of papilloma, gender, and HPV sub-types, in order to identify patients with increased need for frequent surgical treatment. Results: The median age of the RRP patients (n = 48) was 44.5 years; 34 (71%) were males and 14 (29%) females, most were infected with HPV 6. Patients with high surgical treatment frequency/year were significantly younger and showed more widespread papillomatous vegetation in the larynx, compared to the low frequency treated group. 相似文献
7.
8.
Zaher H. Sbeity Axel Jaksche Sybille Martin Karin U. Loeffler 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》2006,244(7):883-884
Purpose We report a case of periocular subcutaneous macrofilariasis as an initial sign of a systemic Loa loa infection.Methods Thorough history, eye examination and surgical intervention. Parasitological and serological analysis.Results A periocular adult Loa loa worm was extracted from the left upper eyelid in an African student living in Germany after presenting to our department with intermittent attacks of painful lid swelling. Four weeks later he presented with Calabar swellings in his arms without serological evidence of microfilaria and was treated with diethylcarbamazine.Conclusion Due to increasing migration of populations to Europe rare manifestations of ocular loiasis are becoming more common. Intermittent painful eyelid swelling in patients who visited or have lived in Africa should always raise the suspicion of systemic loiasis. 相似文献
9.
Dietmar Georg PhD Bernhard Kroupa Petra Georg Peter Winkler Joachim Bogner Karin Dieckmann Richard Pötter 《Strahlentherapie und Onkologie》2006,182(8):473-480
PURPOSE: To compare commercial treatment-planning systems (TPS) for inverse planning (IP) and to assess constraint variations for specific IMRT indications. MATERIAL AND METHODS: For IP, OTP, XiO and BrainSCAN were used and step-and-shoot intensity-modulated radiotherapy (IMRT) delivery was assumed. Based on identical constraints, IP was performed for a prostate, head and neck, brain, and gynecologic case. IMRT plans were compared in terms of conformity/homogeneity, dose-volume histograms (DVHs), and delivery efficiency. For ten patients each of a class of indications, constraint variations were evaluated. RESULTS: IMRT plans were comparable concerning minimum target dose, homogeneity, conformity, and maximum doses to organs at risk. Larger differences were seen in dose gradients outside the target, monitor units, and segment number. Using help structures proved efficient to shape isodoses and to reduce segmentation workload. For IMRT class solutions, IP constraint variations depended on anatomic site. CONCLUSION: IP systems requiring doses as input and having objective functions based on physical parameters had a very similar performance. Constraint templates can be established for a class of IMRT indications. 相似文献
10.
The purpose of this study was to describe health experiences, focused on gender and return to work, in subjects with chronic low back pain in a long-term perspective. The convenient sample consisted of 12 subjects who had attended a pain rehabilitation program 6 years earlier. Typed interviews were transcribed, and a content analysis approach was used. Five categories were found: coping, root causes, control/influence, pain, and sleep. The interviews showed that the subjects expressed well-being, although pain had become part of their daily life. However, both gender and well-being group differences were identified. The women and the group with reduced well-being used the root causes category in a higher degree than the men and the well-being group did. The conclusion is that there are differences according to both gender and return to work within the subjects with chronic pain and that these differences are related to both root causes and coping pattern. 相似文献