private DefaultMutableTreeNode newTreeNode(Study study, VDC vdc) {

    String url = null;
    if (studyUrl != null) {
      url =
          appendParameterToUrl("/dvn/dv/" + vdc.getAlias() + studyUrl, "studyId=" + study.getId());
    }

    StudyUI studyUI = new StudyUI(study);

    String studyText = studyUI.getMetadata().getTitle();
    if (!StringUtil.isEmpty(studyUI.getAuthors())) {
      studyText += " by " + studyUI.getAuthors();
    }

    return newTreeNode(studyText, url, false);
  }