function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Annals and magazine of natural history', 1],
    ['Monatsberichte der Königlich Preussischen Akademie des Wissenschaften zu Berlin', 3],
    ['Philosophical Transactions of the Royal Society of London', 9],
    ['Report on the Scientific Results of the Voyage of H. M. S. Challenger during the Years 1873 – 76, Zoology', 2],
    ['ZooKeys', 36],
    ['Zootaxa', 77]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=128)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);