According to the World Health Organization, there is a great disparity in the life expectancy rate in low-income countries than in high-income countries, such as Australia, Canada, U.S., and U.K., among others. In 2016, life expectancy was 18.1 years lower in low-income countries (62.7 years) than in high-income countries (80.8 years). In low-income countries, on an average, fewer than 3 out of 5 newborns are expected to reach 70 years, and more than one-third of total deaths are among children younger than 15 years. These premature deaths are mainly due to lower respiratory infections, gastro-intestinal infections, acquired immunodeficiency syndrome (AIDS), malaria, and premature birth complications. Among the various prevailing chronic diseases, cancer is the second-leading cause of deaths after cardiovascular disorders, globally, which accounts for an estimated 9.6 million deaths in 2018. Other than cancer, infectious diseases, such as HIV/AIDS, Tuberculosis, Malaria, and HP...