function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Achterberg, Cornelis van', 2],
    ['Braet, Yves & Rousse, Pascal & Sharkey, Michael', 12],
    ['Kittel, Rebecca N.', 2],
    ['Madl, M. & Achterberg, C. Van', 13],
    ['N. S & Ghahari, H. & W, Ascogaster & P, Chelonus', 2],
    ['Szépligeti, Gyozo', 2],
    ['Zettel, Herbert', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=34)',
    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);