function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['De Smet, Willem H.', 2],
    ['De Smet, Willem H. & Verolet, Michel', 1],
    ['Fischer, Claus & Ahlrichs, Wilko H.', 1],
    ['Jersabek, Christian D. & Weithoff, Guntram & Weisse, Thomas', 1],
    ['LUKASHANETS, Dzmitry A. & VEZHNAVETS, Vasily V.', 3],
    ['Sharma, B. K. & Sharma, Sumita', 1],
    ['Sørensen, Martin Vinther', 2],
    ['Weber, E. F.', 1],
    ['Wilts, Eike F. & Bininda-Emonds, Olaf R. P. & Ahlrichs, Wilko H.', 2],
    ['Yang, Hee-Min & Min, Gi-Sik', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=19)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);