function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Braun, D. M.', 1],
    ['Bromley-Schnur, Heather J.', 2],
    ['Gammoudi, Mehrez & Garbouj, Myriam & Egger, Bernhard', 2],
    ['Harrath, Abdul Halim & Sluys, Ronald & Merzoug, Djemoi', 2],
    ['Müller, Otto Friedrich', 1],
    ['Stocchino, Giacinta Angela', 4],
    ['Vila-Farré, Miquel & Sluys, Ronald & Almagro, Ío', 8]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);