To be a doctor in a locality one must first know the endemic diseases there. For example, favism, though rather common in Hong Kong, is not common knowledge among UK graduates.
要喺一個地方做醫生，首先要對嗰笪地方嘅風土病有基本嘅認識，例如香港人好常見嘅蠶豆症，喺英國畢業嘅醫生，就未必識嘞。