function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Hecher, Ch. & Zettel, H.', 6],
    ['Heiss, Ernst & Eckelt, Andreas & Lederwasch, Manfred', 6],
    ['Kment, Petr & Kolínová, Zdislava', 5],
    ['Li, Zihe & Jin, Zezhong & Bu, Wenjun & Ye, Zhen', 4],
    ['Pelingen, Arthien Lovell & Zettel, Herbert', 2],
    ['Watanabe, Kohei & Hayashi, Masakazu', 1],
    ['Ye, Zhen & Bu, Wenjun', 7],
    ['Ye, Zhen & Polhemus, Dan A. & Bu, Wenjun', 13]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=44)',
    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);