function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Abhandlungen Naturwiss. Vereins Bremen', 1],
    ['Arch Naturgesch (Berl) Wiegmann Ar', 4],
    ['Biodiversity Data Journal', 2],
    ['Crustaceana', 1],
    ['European Journal of Taxonomy', 3],
    ['Hallageriis', 1],
    ['Journal of Natural History', 2],
    ['Proceedings of the Japanese Society of Systematic Zoology', 2],
    ['Studies on Neotropical Fauna and Environment', 2],
    ['Zoologische Jahrbucher, Abteilung für Systematik', 1],
    ['Zootaxa', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=22)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 11, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);