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  1. 13301
    “…Objective: This study aimed to investigate the impact of the first wave of the COVID-19 pandemic on perceived working environment, including the possibility to recover, among psychiatric healthcare workers (PHCWs) in comparison with pre-pandemic measures. …”
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    A Survey of Psychiatric Healthcare Workers' Perception of Working Environment and Possibility to Recover Before and After the First Wave of COVID-19 in Sweden
  2. 13302
    “…It is recommended that all major trauma units include a simple question on signs of COVID-19 to provide an early warning system for further waves.…”
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    COVID-19: using chest CT of major trauma patients to monitor and evaluate the second wave in London and the development of routine monitoring in practice
  3. 13303
    “…CONCLUSION: During the first wave of the pandemic, rates of SARS-CoV-2 infection at sites for people experiencing homelessness in Toronto varied significantly over time. …”
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    Prevalence of SARS-CoV-2 infection among people experiencing homelessness in Toronto during the first wave of the COVID-19 pandemic
  4. 13304
    “…The present study was conducted to compare the WaveOne and NeoEndo retreatment file system for the removal of gutta-percha from the root canal. …”
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    A Comparative Study of the Efficacy of WaveOne and NeoEndo Retreatment File System for the Removal of Gutta Percha from the Root Canal
  5. 13305
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    1034. FebriDx use in Immunocompromised Patients in a Real-World Hospital Setting during the second (COVID-19) wave in Italy
  6. 13306
    por Huy, Nguyen Tien, Chico, R. Matthew, Huan, Vuong Thanh, Shaikhkhalil, Hosam Waleed, Uyen, Vuong Ngoc Thao, Qarawi, Ahmad Taysir Atieh, Alhady, Shamael Thabit Mohammed, Vuong, Nguyen Lam, Truong, Le Van, Luu, Mai Ngoc, Dumre, Shyam Prakash, Imoto, Atsuko, Lee, Peter N., Tam, Dao Ngoc Hien, Ng, Sze Jia, Hashan, Mohammad Rashidul, Matsui, Mitsuaki, Duc, Nguyen Tran Minh, Karimzadeh, Sedighe, Koonrungsesomboon, Nut, Smith, Chris, Cox, Sharon, Moji, Kazuhiko, Hirayama, Kenji, Linh, Le Khac, Abbas, Kirellos Said, Dung, Tran Nu Thuy, Mohammed Ali AL-Ahdal, Tareq, Balogun, Emmanuel Oluwadare, Duy, Nguyen The, Mohamed Eltaras, Mennatullah, Huynh, Trang, Hue, Nguyen Thi Linh, Khue, Bui Diem, Gad, Abdelrahman, Tawfik, Gehad Mohamed, Kubota, Kazumi, Nguyen, Hoang-Minh, Pavlenko, Dmytro, Trang, Vu Thi Thu, Vu, Le Thuong, Hai Yen, Tran, Yen-Xuan, Nguyen Thi, Trang, Luong Thi, Dong, Vinh, Sharma, Akash, Dat, Vu Quoc, Soliman, Mohammed, Abdul Aziz, Jeza, Shah, Jaffer, Hung, Pham Dinh Long, Jee, Yap Siang, Phuong, Dang Thuy Ha, Quynh, Tran Thuy Huong, Giang, Hoang Thi Nam, Huynh, Vy Thi Nhat, Thi, Nguyen Anh, Dhouibi, Nacir, Phan, Truc, Duru, Vincent, Nam, Nguyen Hai, Ghozy, Sherief
    Publicado 2021
    “…This study aimed to describe the level of awareness and preparedness of hospital HCWs at the time of the first wave. METHODS: This multinational, multicenter, cross-sectional survey was conducted among hospital HCWs from February to May 2020. …”
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    Awareness and preparedness of healthcare workers against the first wave of the COVID-19 pandemic: A cross-sectional survey across 57 countries
  7. 13307
    “…PURPOSE: This study assessed the combined accuracy of optic nerve sheath diameter (ONSD), strain ratio (SR), and shear wave elastography (SWE) of the optic nerve (ON) in patients with idiopathic intracranial hypertension (IIH). …”
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    Combined accuracy of optic nerve sheath diameter, strain ratio, and shear wave elastography of the optic nerve in patients with idiopathic intracranial hypertension
  8. 13308
    “…Approximately one year later (winter 2020/21), during the second wave, the study was repeated, and a second data set was analyzed. …”
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    Sentiment Analysis of Comments of American Birders during Two Waves of the COVID-19 Pandemic Reveal More Negative Sentiments in the Context of Birding
  9. 13309
    “…Conclusions: There was a 14.7% reduction of admissions for AMI during the first wave of COVID-19. FMC-to-PCI time increased during the peri-lockdown period, however, it did not translate into worse survival during follow-up.…”
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    Increase of Myocardial Ischemia Time and Short-Term Prognosis of Patients with Acute Myocardial Infarction during the First COVID-19 Pandemic Wave
  10. 13310
    “…RESULTS: There were 799 893 eligible pregnant individuals included in the analysis; 705 767 delivered in the pre-pandemic period and 94 126 during the pandemic wave 1 period. Significant immediate decreases were observed for hospital births (relative risk [RR] 0.99; 95% CI 0.98–0.99), length of stay (median change –3.29 h; 95% CI –3.81 to –2.77), use of nitrous oxide (RR 0.11; 95% CI 0.09–0.13) and general anesthesia (RR 0.69; 95% CI 0.58– 0.81), and trial of labour after cesarean (RR 0.89; 95% CI 0.83–0.96). …”
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    Maternal-Newborn Health System Changes and Outcomes in Ontario, Canada, During Wave 1 of the COVID-19 Pandemic—A Retrospective Study
  11. 13311
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    First and second wave of coronavirus-19 disease: A comparative study in patients hospitalized in an ICU of a third-level university hospital()
  12. 13312
    “…We conducted a retrospective epidemiological study to characterize asymptomatic COVID-19 cases occurred in the Apulia region, Italy, during the first epidemic wave of COVID-19 outbreak (February 29-July 7, 2020). …”
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    Estimating the Proportion of Asymptomatic COVID-19 Cases in an Italian Region with Intermediate Incidence during the First Pandemic Wave: An Observational Retrospective Study
  13. 13313
    “…In this work, spherical flower-shaped composite carbonyl iron powder@MnO(2) (CIP@MnO(2)) with CIP as the core and ultrathin MnO(2) nanosheets as the shell was successfully prepared by a simple redox reaction to improve oxidation resistance and electromagnetic wave absorption properties. The microwave-absorbing properties of CIP@MnO(2) composites with different filling ratios (mass fractions of 20%, 40%, and 60% after mixing with paraffin) were tested and analyzed. …”
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    Enhanced Electromagnetic Wave Absorption Properties of Ultrathin MnO(2) Nanosheet-Decorated Spherical Flower-Shaped Carbonyl Iron Powder
  14. 13314
    por Yang, Hyunwoo, Jeong, Yong
    Publicado 2021
    “…In particular, sharp-wave ripple (SWR) is a principal hippocampus oscillation that coordinates with RSC activity. …”
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    Correlation between Alteration of Sharp-wave Ripple Coupled Cortical Oscillation and Long-term Memory Deficit in Alzheimer Disease Model Mice
  15. 13315
    “…We focus on the question if the relevant factors differ between the 2nd (when no variant of concern (VOC) circulated) and the 3rd wave (when VOC B.1.1.7 (Alpha) predominated). METHODS: Based on panel data from a weekly online survey of ECEC centre managers (calendar week 36/2020 to 22/2021, ongoing) including approx. 8500 centres, we estimate the number of SARS-CoV-2 infections in children and staff using random-effect-within-between (REWB) panel models for count data in the 2nd and 3rd wave. …”
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    COVID-19 infections in day care centres in Germany: social and organisational determinants of infections in children and staff in the second and third wave of the pandemic
  16. 13316
    “…During the first wave of COVID-19, nearly 50% of France's fatalities occurred in nursing homes. …”
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    Incidence and outcomes of COVID-19 first wave pandemic in a French nursing home with residents suffering from severe mental illnesses
  17. 13317
    “…We investigated delays in TB treatment among notified patients during the first wave of the COVID-19 pandemic in Korea. METHODS: We systemically collected and analyzed data from the Korea TB cohort database from January to May 2020. …”
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    Increased Healthcare Delays in Tuberculosis Patients During the First Wave of COVID-19 Pandemic in Korea: A Nationwide Cross-Sectional Study
  18. 13318
    “…We also found that 7% of nonusers as of wave 2 became new adopters by wave 3, 95% CI (0.05% to 0.08%). …”
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    Adoption and continued use of mobile contact tracing technology: multilevel explanations from a three-wave panel survey and linked data
  19. 13319
    “…METHOD: This longitudinal study comprised four measurement points. The first wave sample included 1130 responses and was representative of the Polish population in terms of gender, age, and place of residence. …”
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    Barriers and facilitators of willingness to vaccinate against COVID-19: Role of prosociality, authoritarianism and conspiracy mentality. A four-wave longitudinal study
  20. 13320
    “…OBJECTIVES: To assess the prevalence of mental disorders during the second wave of COVID-19 pandemic in comparison with both, baseline and the first wave of the pandemic, and to identify disproportionally affected non-clinical subgroups. …”
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    Prevalence of current mental disorders before and during the second wave of COVID-19 pandemic: An analysis of repeated nationwide cross-sectional surveys
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