**1. Introduction**

A chronic health condition is simply defined as a physical, mental or cognitive disorder that lasts more than one year, requires long-term monitoring and treatment, deteriorates quality of life and causes certain difficulties associated with the physical, cognitive and/or psychological disabilities. We know perfectly well that the prevalence of chronic diseases is increasing rapidly all over the world, especially in low-income countries. It is also a well-proven fact that three-fifths of human deaths worldwide are attributed to four major noncommunicable chronic conditions such as cardiovascular disease (e.g., heart attack, stroke), cancers, chronic lung diseases (e.g., asthma, chronic obstructive pulmonary disease) and diabetes mellitus [1]. Globally, about one-third of all adults suffer from more than one chronic condition. Although there is lack of a precise and consistent term and definition to describe such patients, "multimorbidity", "multiple chronic conditions" (MCC), and "polychronic disease" are the most widely used terms interchangeably [2–4]. Currently, "MCC" is still very popular, easily understood and the most commonly used term in both academic medical literature and non-academic environments worldwide [3].
