function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['African Entomology', 4],
    ['Beiträge zur Entomologie', 2],
    ['Bulletin de la Société Impériale des Naturalistes de Moscou', 1],
    ['Denisia', 2],
    ['Entomologische Blättertter und Coleoptera', 1],
    ['Entomologische Nachrichten und Berichte', 1],
    ['Entomologische Zeitschrift', 3],
    ['Linzer biologische Beiträge', 1],
    ['Raffles Bulletin of Zoology', 6],
    ['Zootaxa', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=22)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);