“…Nineteen studies (40.43%) were from the USA, nine studies (19.15%) were from the UK, seven (40.43%) from China, two (4.26%) from Denmark, Sweden, and Norway, respectively, and one study (2.13%) from Netherlands, Canada, Japan, Italy, and Switzerland, respectively. There were also one multinational study and the investigated population was from US, Canada, India, Jordan, New Zealand, Philippines, Tanzania, and UK …”