function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 1],
    ['Kim, Sangjin & Sohn, Juhyeong & Kim, Hyojoong', 2],
    ['Kozhin, Mikhail & Sennikov, Alexander', 1],
    ['Kvaček, Zlatko & Teodoridis, Vasilis & Radoň, Miroslav', 1],
    ['Victor & Eastop, F. & Blackman, Roger L.', 2],
    ['Zacca, Thamara & Mielke, Olaf H. H. & Pyrcz, Tomasz W.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=8)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);