Tropical Medicine: The branch of medicine concerned with diseases, mainly of parasitic origin, common in tropical and subtropical regions.New Orleans: City in Orleans Parish (county), largest city in state of LOUISIANA. It is located between the Mississippi River and Lake Pontchartrain.Travel: Aspects of health and disease related to travel.History, 19th Century: Time period from 1801 through 1900 of the common era.Parasitic Diseases: Infections or infestations with parasitic organisms. They are often contracted through contact with an intermediate vector, but may occur as the result of direct exposure.History, 20th Century: Time period from 1901 through 2000 of the common era.Authorship: The profession of writing. Also the identity of the writer as the creator of a literary production.Bibliometrics: The use of statistical methods in the analysis of a body of literature to reveal the historical development of subject fields and patterns of authorship, publication, and use. Formerly called statistical bibliography. (from The ALA Glossary of Library and Information Science, 1983)Schools, Medical: Educational institutions for individuals specializing in the field of medicine.Periodicals as Topic: A publication issued at stated, more or less regular, intervals.Publishing: "The business or profession of the commercial production and issuance of literature" (Webster's 3d). It includes the publisher, publication processes, editing and editors. Production may be by conventional printing methods or by electronic publishing.History, 21st Century: Time period from 2001 through 2100 of the common era.World Health: The concept pertaining to the health status of inhabitants of the world.Developing Countries: Countries in the process of change with economic growth, that is, an increase in production, per capita consumption, and income. The process of economic growth involves better utilization of natural and human resources, which results in a change in the social, political, and economic structures.