function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Park, Kyu-Tek & Aarvik, Leif', 3],
    ['Park, Kyu-Tek & Cho, Soowon', 5],
    ['Park, Kyu-Tek & Karisch, Timm', 5],
    ['Park, Kyu-Tek & Mey, Wolfram & Koo, Jun-Mo & Prins, Jurate De', 22],
    ['Park, Kyu-Tek & Prins, Willy De', 7],
    ['Park, Kyu-Tek & Yu, Tae-Uk & Karisch, Timm', 7]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=49)',
    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);