April 2020PRISMA diagram in the submitted manuscript provides the numbers of papers that were rejected and the reasons for rejection in each step of the process, and a full list of all the identified papers and, if applicable, their reasons for ineligibility are provided in the first appendix, submitted along with the manuscript. 110 studies were deemed eligible after full-text screening. Non-participation3 studies deemed to potentially be eligible based on title, keywords and abstract screening could not be retrieved via their respective journals or upon request via the corresponding author. RandomizationNo experiments were conducted in this research and thus needed no randomisation was required. Reporting for specific materials, systems and methodsWe require information from authors about some types of materials, experimental systems and methods used in many studies. Here, indicate whether each material, system or method listed is relevant to your study. If you are not sure if a list item applies to your research, read the appropriate section before selecting a response.