function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bertkau', 1],
    ['Bösenberg, W', 1],
    ['Chen Zhang', 2],
    ['Chyzer, C., Kulczynski, L.', 2],
    ['Heimer, S., Nentwig, W.', 1],
    ['Kropf, C.', 3],
    ['LePeru', 2],
    ['Levi, H. W., Levi, L. R.', 1],
    ['Lopardo, Lara & Hormiga, Gustavo', 1],
    ['Oj, Ryoji', 2],
    ['Ono', 2],
    ['Roberts', 2],
    ['Thaler, K.', 2],
    ['Wiele, H.', 2],
    ['Zhang, Z. H. & Z. F. Chen', 2],
    ['Other (4)', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=30)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);