全文获取类型
收费全文 | 1409853篇 |
免费 | 115694篇 |
国内免费 | 3377篇 |
专业分类
耳鼻咽喉 | 18393篇 |
儿科学 | 46571篇 |
妇产科学 | 41057篇 |
基础医学 | 200884篇 |
口腔科学 | 37717篇 |
临床医学 | 126110篇 |
内科学 | 284591篇 |
皮肤病学 | 33373篇 |
神经病学 | 116932篇 |
特种医学 | 53877篇 |
外国民族医学 | 465篇 |
外科学 | 210668篇 |
综合类 | 32894篇 |
现状与发展 | 5篇 |
一般理论 | 487篇 |
预防医学 | 110084篇 |
眼科学 | 31515篇 |
药学 | 98638篇 |
3篇 | |
中国医学 | 3399篇 |
肿瘤学 | 81261篇 |
出版年
2021年 | 10891篇 |
2019年 | 11697篇 |
2018年 | 16611篇 |
2017年 | 12702篇 |
2016年 | 14288篇 |
2015年 | 16052篇 |
2014年 | 22607篇 |
2013年 | 33443篇 |
2012年 | 45440篇 |
2011年 | 48027篇 |
2010年 | 28219篇 |
2009年 | 27089篇 |
2008年 | 44366篇 |
2007年 | 46883篇 |
2006年 | 47446篇 |
2005年 | 45931篇 |
2004年 | 43787篇 |
2003年 | 41750篇 |
2002年 | 40237篇 |
2001年 | 73050篇 |
2000年 | 74555篇 |
1999年 | 61591篇 |
1998年 | 17023篇 |
1997年 | 15445篇 |
1996年 | 15604篇 |
1995年 | 14799篇 |
1994年 | 13409篇 |
1993年 | 12584篇 |
1992年 | 45852篇 |
1991年 | 43490篇 |
1990年 | 41506篇 |
1989年 | 39571篇 |
1988年 | 36184篇 |
1987年 | 35362篇 |
1986年 | 32864篇 |
1985年 | 31281篇 |
1984年 | 23825篇 |
1983年 | 20027篇 |
1982年 | 12209篇 |
1981年 | 10779篇 |
1979年 | 20702篇 |
1978年 | 14576篇 |
1977年 | 12086篇 |
1976年 | 11367篇 |
1975年 | 11621篇 |
1974年 | 13991篇 |
1973年 | 13535篇 |
1972年 | 12637篇 |
1971年 | 11472篇 |
1970年 | 10913篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
92.
93.
94.
95.
Widely Metastatic Squamous Cell Carcinoma Originating from Malignant Transformation of Hypertrophic Lichen Planus in a 24‐Year‐Old Woman: Case Report and Review of the Literature 下载免费PDF全文
Lana X. Tong B.A. Matthew J. Weinstock M.D. Reed Drews M.D. Caroline C. Kim M.D. 《Pediatric dermatology》2015,32(3):e98-e101
Hypertrophic lichen planus (HLP) is a T‐cell‐mediated process typically presenting with hypertrophic or verrucous plaques on the lower limbs. We report the case of a 24‐year‐old woman with a history of HLP since age 3 years presenting with rapid malignant transformation of one lesion into a large squamous cell carcinoma (SCC). Subsequent examination revealed progressive, widespread metastatic involvement, and the patient ultimately died from her disease. SCC associated with HLP is rare, with a review of the literature revealing fewer than 50 cases. This case highlights the need to be aware of suspicious changes in HLP and to educate patients as to when to be reevaluated. 相似文献
96.
Iclea Rocha Gama Euclides Marinho Trindade-Filho Suzana Lima Oliveira Nassib Bezerra Bueno Isabelle Tenório Melo Cyro Rego Cabral-Junior Elenita M. Barros Jaqueline A. Galvão Wanessa S. Pereira Raphaela C. Ferreira Bruna R. Domingos Terezinha da Rocha Ataide 《Metabolic brain disease》2015,30(1):93-98
97.
98.
99.
R.D. Olmos R.C. de Figueiredo E.M. Aquino P.A. Lotufo I.M. Bensenor 《Brazilian journal of medical and biological research》2015,48(8):751-758
Thyroid diseases are common, and use of levothyroxine is increasing worldwide. We
investigated the influence of gender, race and socioeconomic status on the diagnosis
and treatment of thyroid disorders using data from the Brazilian Longitudinal Study
of Adult Health (ELSA-Brasil), a multicenter cohort study of civil servants (35-74
years of age) from six Brazilian cities. Diagnosis of thyroid dysfunction was by
thyrotropin (TSH), and free thyroxine (FT4) if TSH was altered, and the use of
specific medications. Multivariate logistic regression models were constructed using
overt hyperthyroidism/hypothyroidism and levothyroxine use as dependent variables and
sociodemographic characteristics as independent variables. The frequencies of overt
hyper- and hypothyroidism were 0.7 and 7.4%, respectively. Using whites as the
reference ethnicity, brown, and black race were protective for overt hypothyroidism
(OR=0.76, 95%CI=0.64-0.89, and OR=0.53, 95%CI=0.43-0.67, respectively, and black race
was associated with overt hyperthyroidism (OR=1.82, 95%CI=1.06-3.11). Frequency of
hypothyroidism treatment was higher in women, browns, highly educated participants
and those with high net family incomes. After multivariate adjustment, levothyroxine
use was associated with female gender (OR=6.06, 95%CI=3.19-11.49) and high net family
income (OR=3.23, 95%CI=1.02-10.23). Frequency of hyperthyroidism treatment was higher
in older than in younger individuals. Sociodemographic factors strongly influenced
the diagnosis and treatment of thyroid disorders, including the use of
levothyroxine. 相似文献
100.
William G. Breen Krishan R. Jethwa Nathan Y. Yu Grant M. Spears William S. Harmsen Robert C. Miller Jonathan B. Ashman William G. Rule Terence T. Sio Michelle A. Neben-Wittich Michael G. Haddock Amit Mahipal Mark J. Truty Christopher L. Hallemeier Kenneth W. Merrell 《Practical radiation oncology》2021,11(1):e63-e69
PurposeOur purpose was to determine the effect of chemoradiotherapy (CRT) on patient-reported quality of life (QOL) for patients with intact pancreas cancer.Methods and MaterialsWe reviewed a prospective QOL registry for patients with intact, clinically localized pancreatic ductal adenocarcinoma treated with CRT between June 2015 and November 2018. QOL was assessed pre-CRT (immediately before CRT, after neoadjuvant chemotherapy) and at the completion of CRT with the Functional Assessment of Cancer Therapy-Hepatobiliary (FACT-Hep) and its component parts: FACT-General (FACT-G) and hepatobiliary cancer subscore (HCS). A minimally important difference from pre-CRT was defined as ≥ 6, 5, and 8 points for FACT-G, HCS, and FACT-Hep, respectively.ResultsOf 157 patients who underwent CRT, 100 completed both pre- and post-CRT surveys and were included in the primary analysis. Median age at diagnosis was 65 years (range, 23-90). National Comprehensive Cancer Network resectability status was resectable (3%), borderline resectable (40%), or locally advanced (57%). Folinic acid, 5-fluorouracil, irinotecan, and oxaliplatin (FOLFIRINOX) (75%) or gemcitabine and nab-paclitaxel (42%) were given for a median of 6 cycles (range, 0-42) before CRT. Radiation therapy techniques included 3-dimensional conformal (22%), intensity modulated photon (55%), and intensity modulated proton (23%) radiation therapy to a median dose of 50 Gy (range, 36-62.5). Concurrent chemotherapy was most commonly capecitabine (82%). Sixty-three patients (63%) had surgery after CRT. The mean decline in FACT-G, HCS subscale, and FACT-Hep from pre- to post-CRT was 3.5 (standard deviation [SD], 13.7), 1.7 (SD 7.8), and 5.2 (SD 19.4), respectively. Each of these changes were statistically significant, but did not meet the minimally important difference threshold. Pancreatic head tumor location was associated with decline in FACT-Hep. Nausea was the toxicity with the greatest increase from pre- to post-CRT by both physician-assessment and patient-reported QOL.ConclusionsFor patients with intact pancreatic adenocarcinoma, modern CRT is well tolerated with minimal decline in QOL during treatment. 相似文献