function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Dall, William Healey', 2],
    ['Fedosov, Alexander & Olivera, Baldomero M. & Watkins, Maren', 2],
    ['Hansen, Thomas', 1],
    ['Kiel, Steffen & Sami, Marco & Taviani, Marco', 2],
    ['Kreipl, Kurt & Alf, Axel & Eggeling, Tilo', 1],
    ['Mariottini, Paolo & Smriglio, Carlo & Oliverio, Marco', 1],
    ['Röding, Peter Friedrich', 1],
    ['Scopoli, Giovanni Antonio', 1],
    ['Tan, S. K. & Ng, H. E. & Nguang, L. H. S.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);