Include the following  in the paper : 1. Abstract A concise and factual abstract is required (maximum length of 150 words). The abstract should state briefly the purpose of the research, the principal results and major conclusions. An abstract is often presented separate from the article, so it must be able to stand alone. 2. Keywords Immediately after the abstract, provide a maximum of 8 keywords, avoiding general and plural terms and multiple concepts (avoid, for example, ‘and’, ‘of’).