INTRODUCTIONRadiology has been greatly advanced in China sinceits founding in 1949 and has been developed fasterand further more since China adopted the policy ofsocioeconomic reform in 1978.It plays anincreasingly im...INTRODUCTIONRadiology has been greatly advanced in China sinceits founding in 1949 and has been developed fasterand further more since China adopted the policy ofsocioeconomic reform in 1978.It plays anincreasingly important role in the medical healthcare and treatment in the country and has reachedthe world’s advanced level in certain fields.We nowbriefly review the history of China’s radiology so asto give a clear picture of its development.展开更多
Objective: To demonstrate the impact of inadequate standardization and population coverage on the ability to measure and improve maternal mortality in the United States. Data Sources: The CDC Wonder system for the yea...Objective: To demonstrate the impact of inadequate standardization and population coverage on the ability to measure and improve maternal mortality in the United States. Data Sources: The CDC Wonder system for the years 2000-2015 using the following definitions of maternal mortality and associated ICD-CM-10 codes: 1) Maternal deaths up to 42 days after delivery (A34, O00-O99, except O96-O97);2) Maternal deaths within one year after delivery (A34, O00-O99, except O97);3) All maternal deaths (A34, O00-O99). Study Design: For each year between 2000-2015, we provided maternal deaths, live births, and calculated maternal mortality ratios (MDR). For deaths within 42 days, we also calculated adjusted mortality ratios (ADR). Principal Findings: Maternal mortality comparisons which utilize inconsistent definitions and apply non-validated statistical adjustments produce specious results. Conclusions: Variation and inconsistency in definitions, coding, and other reporting anomalies render the current aggregated vital statistics on maternal mortality inadequate for accurate trending and service impact studies. The definition of maternal mortality must be expanded to all outcomes of pregnancy: births, induced abortions, and natural fetal losses.展开更多
Background Citation analysis provides insights into the history and developmental trajectory of scientific fields. Our objec-tive was to perform an analysis of citation classics in the journals of pediatric specialty ...Background Citation analysis provides insights into the history and developmental trajectory of scientific fields. Our objec-tive was to perform an analysis of citation classics in the journals of pediatric specialty and to examine their characteristics. Methods Initially, all the journals listed under the category of pediatrics (n = 120) were identified using Journal Citation Reports. Web of science database was then searched (1950–2016) to select the top-100 cited articles in the above identified pediatric journals. The top-100 cited article were categorized according the study design, sub-specialty, country, institutional affiliation, and language. Results The top-100 articles were published in 18 different journals, with Pediatrics having the highest numbers (n = 40), followed by The Journal of Pediatrics (n = 17). The majority (n = 62) of classics were published after 1990. The most cited article had citation count of 3516 and the least cited had a citation count of 593. The USA (n = 71) was the most commonly represented country, and 60 institutions contributed to 100 articles. Fifteen authors contributed to more than one classic as first or second author. Observational study (n = 55) was the commonest study design across all decades, followed by reviews (n = 12), scale development studies (n = 11), and guidelines (n = 11). Among the pediatric sub-specialties, growth and development articles were highly cited (n = 24), followed by pediatric psychiatry and behavior (n = 21), endocrinology (n = 15), and neonatology (n = 12). Conclusions The top-100 cited articles in pediatrics identify the impactful authors, journals, institutes, and countries. Obser-vational study design was predominant—implying that inclusion among citation classics is not related to soundness of study design.展开更多
文摘INTRODUCTIONRadiology has been greatly advanced in China sinceits founding in 1949 and has been developed fasterand further more since China adopted the policy ofsocioeconomic reform in 1978.It plays anincreasingly important role in the medical healthcare and treatment in the country and has reachedthe world’s advanced level in certain fields.We nowbriefly review the history of China’s radiology so asto give a clear picture of its development.
文摘Objective: To demonstrate the impact of inadequate standardization and population coverage on the ability to measure and improve maternal mortality in the United States. Data Sources: The CDC Wonder system for the years 2000-2015 using the following definitions of maternal mortality and associated ICD-CM-10 codes: 1) Maternal deaths up to 42 days after delivery (A34, O00-O99, except O96-O97);2) Maternal deaths within one year after delivery (A34, O00-O99, except O97);3) All maternal deaths (A34, O00-O99). Study Design: For each year between 2000-2015, we provided maternal deaths, live births, and calculated maternal mortality ratios (MDR). For deaths within 42 days, we also calculated adjusted mortality ratios (ADR). Principal Findings: Maternal mortality comparisons which utilize inconsistent definitions and apply non-validated statistical adjustments produce specious results. Conclusions: Variation and inconsistency in definitions, coding, and other reporting anomalies render the current aggregated vital statistics on maternal mortality inadequate for accurate trending and service impact studies. The definition of maternal mortality must be expanded to all outcomes of pregnancy: births, induced abortions, and natural fetal losses.
文摘Background Citation analysis provides insights into the history and developmental trajectory of scientific fields. Our objec-tive was to perform an analysis of citation classics in the journals of pediatric specialty and to examine their characteristics. Methods Initially, all the journals listed under the category of pediatrics (n = 120) were identified using Journal Citation Reports. Web of science database was then searched (1950–2016) to select the top-100 cited articles in the above identified pediatric journals. The top-100 cited article were categorized according the study design, sub-specialty, country, institutional affiliation, and language. Results The top-100 articles were published in 18 different journals, with Pediatrics having the highest numbers (n = 40), followed by The Journal of Pediatrics (n = 17). The majority (n = 62) of classics were published after 1990. The most cited article had citation count of 3516 and the least cited had a citation count of 593. The USA (n = 71) was the most commonly represented country, and 60 institutions contributed to 100 articles. Fifteen authors contributed to more than one classic as first or second author. Observational study (n = 55) was the commonest study design across all decades, followed by reviews (n = 12), scale development studies (n = 11), and guidelines (n = 11). Among the pediatric sub-specialties, growth and development articles were highly cited (n = 24), followed by pediatric psychiatry and behavior (n = 21), endocrinology (n = 15), and neonatology (n = 12). Conclusions The top-100 cited articles in pediatrics identify the impactful authors, journals, institutes, and countries. Obser-vational study design was predominant—implying that inclusion among citation classics is not related to soundness of study design.
