I have experience as a contributor with two of the organizations that you list as questionable publishers. First, OMICs Group. I attended and presented at one of their conferences and was very pleased at how professional they were despite their small size. My article was not accepted by their peer review committee. Next, Photon Journal for Public Health. Very professional and did everything they said they would do within the timeframe they promised. They put a lot of good peer-reviewed comments into my paper and required that I make the changes. They were very professional. Their website needs work. It is difficult to browse articles. In neither case did I find anything questionable about these organizations at all.
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