function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bary, Brian M.', 1],
    ['Durán-Ramírez, Carlos Alberto & Dias, Roberto Júnio Pedroso', 1],
    ['Ehrenberg, Christian Gottfried', 2],
    ['Foissner, Wilhelm & Stoeck, Thorsten', 2],
    ['Issel, Raffaele', 1],
    ['Jankowski, Anatol Wiktor', 1],
    ['Lepsi, Iosif', 2],
    ['Park, Kyung-Min & Min, Gi-Sik & Kim, Sanghee', 1],
    ['Sonntag, Bettina & Strüder-Kypke, Michaela C. & Summerer, Monika', 1],
    ['Stein, Friedrich', 2],
    ['Stokes, Alfred Cheatham', 4],
    ['Vuxanovici, A.', 1],
    ['Wenzel, Fritz', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);