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Hello everybody, sorry for cross posting! I've seen that there are many similar levels of evidence designed. When looking for the evidence do I have to follow some of those levels of evidence already made, or can I develop my own depending on the literature found and it's quality?. If the latter is the case, I guess that I have to have different levels of evidence for every research question. Any ideas based on experience? Thanks a lot. Julia %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%