function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Blackburn, T. & Sharp, David', 2],
    ['Guérin-Méneville, Félix Édouard', 1],
    ['Herrmann, Andreas & Háva, Jiří', 2],
    ['Herrmann, Andreas & Háva, Jiří & Kadej, Marcin', 4],
    ['Háva, Jiří & Herrmann, Andreas', 1],
    ['Háva, Jiří & Herrmann, Andreas & Kadej, Marcin', 1],
    ['Kadej, Marcin & Háva, Jiří', 6],
    ['Kiselyova, Tatiana', 1],
    ['Pic, Maurice', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=19)',
    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);