Examples of type I duplicates (duplicates among databases).

<p>Notes:</p><p>– All examples originated from the literatures regarding portal vein thrombosis.</p><p>– In every example, the same study was simultaneously recorded by two or three databases.</p><p>– All literatures were expressed in Vancouver reference type.</p><p>– Bold and <i>italics</i> formatting indicated the different styles between index and redundant paper(s).</p><p>– In every example, the reference recorded by PubMed database had more complete information.</p>