function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Narakusumo, Raden Pramesa & Balke, Michael & Riedel, Alexander', 8],
    ['Riedel, Alexander', 24],
    ['Riedel, Alexander & Narakusumo, Raden Pramesa', 105],
    ['Riedel, Alexander & Sagata, Katayo & Surbakti, Suriani', 102],
    ['Riedel, Alexander & Taenzler, Rene', 33],
    ['Riedel, Alexander & Taenzler, Rene & Balke, Michael', 100],
    ['Van Dam, Matthew H. & Laufa, Raymond & Riedel, Alexander', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=377)',
    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);