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Every trial plan, no matter how straightforward, should therefore include a description of how the data will be analysed. The plan should set out the primary endpoints of the study and will often include a power calculation to indicate the sample size needed to confirm or refute the underlying hypothesis with confidence. The simple rule to avoid data dredging is to have a data analysis plan and stick to it. Meetings usually have strict deadlines for abstract submission. Although electronic submission and reviewing may have trimmed a few days off journal schedules, external reviewers remain the rate-limiting step in the peerreview process. The term 'Diamond Open Access' is used to describe Open Access journals that do not charge authors an article processing charge. Directory of Open Access Journals (DOAJ) lists over 10,000 Open Access journals covering a range of disciplines. DOI (Digital Object Identifier) system was introduced to overcome some of the difficulties of citing electronic material.