Researchers and students please take note of the following comment submitted to Beall's List of Predatory, Open-Access Publishers blog:

"Hello.
I write to you after reading your blog and for advice.
I had a serious problem with one of the journals of OMICS Group. After receiving a lot of emails offering me publish my works in their journals, I asked them about the possibility of publishing a research paper. They never told me to pay for publishing. They asked me to read the paper and I made the mistake of sending it. I did not hear anything about this editorial, until three months later they told me that they had accepted the paper and would publish it if I paid to them $ 2,700. Then the manuscript has not been published yet and I told them to publish in its magazine not interested me. I did not receive any review of the manuscript and I saw that the data on the web magazine about impact index were false. I only asked for information and I never authorized the publication of my work. Two months later, they published it without my permission. The published paper is full of errors. Since then I have sent a dozen emails urging the withdrawal of my work on their site. However, they did not withdraw and would require payment of $ 2700. What do you recommend I do? No doubt this is a fraud, and I do not know how to get them to withdraw the work and they stop sending payment requirements.
Thanks for your interest.
Best regards."