全文获取类型
收费全文 | 394186篇 |
免费 | 54189篇 |
国内免费 | 18422篇 |
专业分类
耳鼻咽喉 | 7247篇 |
儿科学 | 8414篇 |
妇产科学 | 5378篇 |
基础医学 | 30103篇 |
口腔科学 | 6071篇 |
临床医学 | 58536篇 |
内科学 | 79933篇 |
皮肤病学 | 10250篇 |
神经病学 | 25976篇 |
特种医学 | 15043篇 |
外国民族医学 | 109篇 |
外科学 | 64590篇 |
综合类 | 44703篇 |
现状与发展 | 129篇 |
一般理论 | 24篇 |
预防医学 | 25252篇 |
眼科学 | 9481篇 |
药学 | 27993篇 |
275篇 | |
中国医学 | 16669篇 |
肿瘤学 | 30621篇 |
出版年
2024年 | 1684篇 |
2023年 | 8559篇 |
2022年 | 11600篇 |
2021年 | 16061篇 |
2020年 | 15996篇 |
2019年 | 10215篇 |
2018年 | 15603篇 |
2017年 | 15378篇 |
2016年 | 15652篇 |
2015年 | 19809篇 |
2014年 | 29379篇 |
2013年 | 29182篇 |
2012年 | 25259篇 |
2011年 | 26989篇 |
2010年 | 24910篇 |
2009年 | 25735篇 |
2008年 | 20184篇 |
2007年 | 17593篇 |
2006年 | 19305篇 |
2005年 | 15712篇 |
2004年 | 10807篇 |
2003年 | 8936篇 |
2002年 | 7742篇 |
2001年 | 8443篇 |
2000年 | 7665篇 |
1999年 | 7642篇 |
1998年 | 6219篇 |
1997年 | 6086篇 |
1996年 | 5355篇 |
1995年 | 5109篇 |
1994年 | 3611篇 |
1993年 | 2553篇 |
1992年 | 2731篇 |
1991年 | 2572篇 |
1990年 | 2015篇 |
1989年 | 2046篇 |
1988年 | 1809篇 |
1987年 | 1505篇 |
1986年 | 1347篇 |
1985年 | 1117篇 |
1984年 | 738篇 |
1983年 | 681篇 |
1982年 | 605篇 |
1981年 | 524篇 |
1980年 | 439篇 |
1979年 | 417篇 |
1978年 | 380篇 |
1977年 | 447篇 |
1975年 | 309篇 |
1972年 | 323篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
52.
53.
54.
PURPOSE: The beneficial role of elective neck dissection (END) in the management of high-risk cutaneous squamous cell carcinoma (CSCC) of the head and neck remains unproven. Some surgical specialists suggest that END may be beneficial for patients with clinically node-negative (N0) high-risk CSCC, but there are few data to support this claim. We reviewed the available literature regarding the use of END in the management of both CSCC and head and neck SCC (HNSCC). METHODOLOGY: The available medical literature pertaining to END in both CSCC and HNSCC was reviewed using PubMed and Ovid Medline searches. RESULTS: Many surgical specialists recommend that END be routinely performed in patients with N0 HNSCC when the risk of occult metastases is estimated to exceed 20%; however, patients who undergo END have no proven survival benefit over those who are initially staged as N0 and undergo therapeutic neck dissection (TND) after the development of apparent regional disease. There is a lack of data regarding the proper management of regional nodal basins in patients with N0 CSCC. In the absence of evidence-based data, the cutaneous surgeon must rely on clinical judgment to guide the management of patients with N0 high-risk CSCC of the head and neck. CONCLUSIONS: Appropriate work-up for occult nodal disease may occasionally be warranted in patients with high-risk CSCC. END may play a role in only a very limited number of patients with high-risk CSCC. 相似文献
55.
56.
57.
58.
S. MD. Iqbal A. K. Garg C. M. Kalaiah 《Indian journal of otolaryngology and head and neck surgery》1987,39(1):38-39
A case of Goldenhar’s Syndrome in a 10 year old girl is reported. The unusual features are the absence of epibulbar dermoid which is one of the major hallmarks of the Syndrome and the presence of an associated Cyanotic Heart disease. 相似文献
59.
Wan-Ling Ho Tien-Wu Yang Wei-Chu Chi Hong-Jen Chang Li-Min Huang Mei-Hwei Chang 《台湾医志》2005,104(6):398-401
BACKGROUND AND PURPOSE: This study investigated the characteristics of intussusception in Taiwanese children of different age groups, including the incidence, length of hospitalization and hospital costs. METHODS: Children with a diagnosis of intussusception who were hospitalized from 1999 through 2001 were identified from a nationwide health insurance claims database. The incidence of intussusception was calculated by age, gender, and season. Length of hospitalization and hospital costs were also analyzed. RESULTS: A total of 6988 cases of intussusception were identified in Taiwan from 1999 to 2001. Among them, 4859 cases occurred in children below 15 years of age. The average incidence among children below age 15 years was 34.5 per 100,000, with a peak incidence of 118.8 per 100,000 observed among children younger than 24 months old. The highest incidence of intussusception in Taiwanese children occurred between 12 and 24 months of age. According to the data for patients below 15 years of age hospitalized for intussusception in year 2000, males were more likely to be affected than females (61.3% vs 38.7%). Intussusception-related hospitalizations were rare in infants in the first few months of life, increased in those 6 to 12 months old, and peaked among children 1 to 3 years old. Among the 952 patients with intussusception admitted to hospitals in 2000, 297 (31.2%) received surgery, incurring higher median medical costs (New Taiwan Dollars [NT dollars] 42,265 or US dollars 1234) and longer median hospital stay (6.2 days) than the 655 patients who did not require surgery (NT dollars 6290 or US dollars 185 for hospitalization of 2.4 days). CONCLUSIONS: The study found that the incidence of intussusception peaked in the second year of life in Taiwanese children. There was also a male predominance and lack of seasonal variation in incidence. 相似文献
60.
Tumor metastasis to the pancreas is a rare but recognized cause of acute pancreatitis. Autopsy series have reported a 24-40% of pancreatic involvement in small cell lung cancer. However, only a very few cases of tumor-induced acute pancreatitis have been described. Budd-Chiari syndrome complicating lung cancer is a rarely reported condition. We report a 68-year-old woman with extensive small cell lung cancer with the unusual initial presentation of both acute pancreatitis and acute Budd-Chiari syndrome. This patient suffered from progressive epigastralgia for 3 weeks. Severe epigastralgia with radiation to back and progressive jaundice developed 2 days prior to admission. After admission, the liver enlarged rapidly and the ascites increased markedly. Chest roentgenogram showed a mass lesion over the left lower lung field. Poorly differentiated carcinoma cells were found in ascites and bone marrow. The patient died on the ninth day of hospitalization before chemotherapy was initiated. Prompt diagnosis of extensive-stage small cell lung cancer may allow early chemotherapy treatment which favorably influences recovery when the pancreatitis is mild. Although prolonged survival might have been expected had this patient recovered from pancreatitis and received chemotherapy, diagnosis was delayed due to difficulty in immunohistochemical diagnosis of the tumor and the unusual clinical presentation. The use of stains employing antibodies against neurofilament and neuron-specific enolase cell antigens is important for early diagnosis of poorly differentiated metastatic tumor cells. 相似文献