Scientific Online Resource System

Scripta Scientifica Medica

The PDF file you selected should load here if your Web browser has a PDF reader plug-in installed (for example, a recent version of Adobe Acrobat Reader).

If you would like more information about how to print, save, and work with PDFs, Highwire Press provides a helpful Frequently Asked Questions about PDFs.

Alternatively, you can download the PDF file directly to your computer, from where it can be opened using a PDF reader. To download the PDF, click the Download link above.

Fullscreen Fullscreen Off

Array
Article Tools
Email this article (Login required)
About The Authors

Dragomir Ivanov
Medical University of Varna
Bulgaria

Faculty of Public Health

Antoaneta Stoyanova
University of Economics–Varna
Bulgaria

Department of Commodity Knowledge, Faculty of Economics

Maria Pavlova
National Center for Parasitic and Infectious Diseases, Sofia
Bulgaria

Spasena Ilieva
Lozenets University Hospital, Sofia

Tsonko Paunov
Medical University of Varna

Department of Hygiene and Epidemiology, Faculty of Public Health;

Regional Health Inspectorate, Varna

Font Size


|