of UNESCO for their valuable review and comments. Contributors are listed in order, and under their contribution. We wish to thank the following people for their kind review and comments (listed in alphabetical order of institution, followed by alphabetical order of surname):ISBN:

Objective: To analyze the characteristics of YouTube videos in Spanish on the basic measures to prevent coronavirus disease 2019 (COVID-19). Methods: On 18 March 2020, a search was conducted on YouTube using the terms “Prevencion Coronavirus” and “Prevencion COVID-19”. We studied the associations between the type of authorship and the country of publication with other variables (such as the number of likes and basic measures to prevent COVID-19 according to the World Health Organization, among others) with univariate analysis and a multiple logistic regression model. Results: A total of 129 videos were evaluated; 37.2% were produced in Mexico (25.6%) and Spain (11.6%), and 56.6% were produced by mass media, including television and newspapers. The most frequently reported basic preventive measure was hand washing (71.3%), and the least frequent was not touching the eyes, nose, and mouth (24.0%). Hoaxes (such as eating garlic or citrus to prevent COVID-19) were detected in 15 videos (10.9%). In terms of authorship, papers produced by health professionals had a higher probability of reporting hand hygiene (OR (95% CI) = 4.20 (1.17–15.09)) and respiratory hygiene (OR (95% CI) = 3.05 (1.22–7.62)) as preventive measures. Conclusion: Information from YouTube in Spanish on basic measures to prevent COVID-19 is usually not very complete and differs according to the type of authorship. Our findings make it possible to guide Spanish-speaking users on the characteristics of the videos to be viewed in order to obtain reliable information.

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ObjectiveTo perform a systematic review to analyze the association between occupational exposure to wood dust and cancer.MethodsA systematic literature search of entries made in the MEDLINE-PubMed database between 1957 and 2013 was conducted to identify studies that had assessed the relationship between occupational exposure to wood dust and different types of cancer. A meta-analysis of selected case-control and cohort studies was subsequently performed.ResultsA total of 114 studies were identified and 70 were selected for review. Of these, 42 studies focused on the relationship between wood dust and nasal cancer (n = 22), lung cancer (n = 11), and other types of cancer (n = 9). Low-to-moderate quality evidence that wood dust acts as a carcinogen was obtained, and a stronger association between wood dust and nasal adenocarcinoma was observed. A lesser association between wood dust exposure and lung cancer was also observed. Several studies suggested that there is a relationship between wood dust and the onset of other cancers, although there was no evidence to establish an association. A meta-analysis that included four case-controls studies showed that workers exposed to wood dust exhibited higher rates of nasal adenocarcinoma than other workers (odds ratio = 10.28; 95% confidence interval: 5.92 and 17.85; P<0,0001), although a large degree of heterogeneity was found.ConclusionsLow-to-moderate quality evidence supports a causal association between cancer and occupational exposure to wood dust, and this association was stronger for nasal adenocarcinoma than for lung cancer. There was no evidence of an association between wood dust exposure and the other cancers examined.

Objectives: In the field of action of disease associated with dependence the Third Health Plan of Castilla y León aims specifically at promoting the adjustment of health assistance to the needs of disabled people, according to their situation. Our objectives were: General: To know the satisfaction level among relatives or caregivers of people who were treated according to a protocol of dental care for mentally disabled people. Specific: To know if satisfaction is related to any sociodemographic characteristics of patients or to their pathology. Study design: Cross-sectional study by telephone survey, set in the Primary Health Area of Salamanca. The target population includes relatives or caregivers of mentally disabled patients who were sent to the hospital for treatment under general anaesthesia after being attended in Primary Dental Care Units, from 1st of June/2005 to 31st of May/2006. Social and demographic variables and patients’ diseases, as well as level of satisfaction with the service, were studied through a survey. Results: 67.4% of patients’ relatives or caregivers answered the survey, among whom 94.7% (C.I. 95%: 89-100%) were quite or very satisfied with the service in general. Conclusion:The protocol has high acceptance despite its difficulties and it has achieved considerable improvements in several aspects of patients’ life. This level of satisfaction was not related to any sociodemographic or clinical patient characteristics. Nevertheless, accessibility aspects and communication with patients may still be improved. Key words: Health care surveys, dental care for disabled, patient satisfaction.