function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['European Journal of Taxonomy', 1],
    ['Journal of Natural History', 6],
    ['Journal of the Academy of Natural Sciences of Philadelphia', 4],
    ['Report on the Scientific Results of the Voyage of H. M. S. Challenger During the Years 1873 – 76, Zoology', 6],
    ['Schultz', 2],
    ['Transactions of the geological society of London, 2', 1],
    ['ZooKeys', 4],
    ['Zootaxa', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=29)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);