function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Gu, Chang-dong & Shen, J. - w.', 3],
    ['Gupta, N. K. & Sayal, A.', 1],
    ['Li, Daoning & Sun, Yat-sen', 1],
    ['Shen, J. - w.', 5],
    ['Shen, J. - w. & Tong, Yong-yong', 1],
    ['Wang, P. - q.', 1],
    ['Wang, Yan-Yin', 1],
    ['Yamaguti, S.', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=17)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);