function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Achterberg, Cornelis van & You, Lan-Shao & Li, Xi-Ying', 3],
    ['Broad, Gavin R.', 4],
    ['Gomez Duran, Jose-Maria & van Achterberg, Cornelis', 2],
    ['Kolarov, Janko & Erkaya, Ismail & Gürbüz, Mehmet Faruk', 1],
    ['Liu, Jing-Xian & van Achterberg, Cornelis & Zheng, Bo-Ying', 6],
    ['Madl, M.', 1],
    ['Riedel & Pénigot & Schwarz & Diller & Johansson & Japoshvili, G.', 2],
    ['Riedel, Matthias & Diller, Erich & Japoshvili, George', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    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);