function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Buchner, Peter', 1],
    ['Buchner, Peter & Corley, Martin & Junnilainen, Jari', 2],
    ['Buchner, Peter & Karsholt, Ole', 2],
    ['Buchner, Peter & Kemal, Muhabbet & Kızıldağ, Sibel', 1],
    ['Buchner, Peter & Šumpich, Jan', 8],
    ['Butler, Arthur G.', 1],
    ['Huemer, Peter & Van Nieukerken, Erik J.', 1],
    ['Landry, Jean-François & Nazari, Vazrick & Dewaard, Jeremy R.', 1],
    ['Saunders, W. W.', 1],
    ['[DUPLICATE RECORD!] Butler, Arthur G.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);