function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Archiv für Anatomie, Physiologie und Wissenschaftliche Medicin', 1],
    ['Journal of Natural History', 2],
    ['Marine biodiversity', 1],
    ['Meiofauna Marina', 3],
    ['Proceedings of the Biological Society of Washington', 1],
    ['Proceedings of the Japanese Society of Systematic Zoology', 1],
    ['Species Diversity', 2],
    ['Systematics and Biodiversity', 2],
    ['Zeitschrift für Morphologie und Ökologie der Tiere', 1],
    ['ZooKeys', 24],
    ['Zoological Journal of the Linnean Society', 4],
    ['Zoological Science', 2],
    ['Zoosystema', 1],
    ['Zootaxa', 69]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=114)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);