function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Amurian Zoological Journal', 1],
    ['Annals and Magazine of Natural History, Including Zoology, Botany and Geology, Being a Continuation of the \' Magazine of Botany ', 1],
    ['Annals of the Lyceum of Natural History of New York', 1],
    ['Edinburgh encyclopaedia, conducted by David Brewster', 1],
    ['European Journal of Taxonomy', 5],
    ['Journal of Species Research', 8],
    ['Proceedings of the Japanese Society of Systematic Zoology', 2],
    ['Smithsonian Contributions to Zoology', 1],
    ['ZooKeys', 4],
    ['Zoological Journal of the Linnean Society', 7],
    ['Zoosystematics and Evolution', 1],
    ['Zootaxa', 36]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=68)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);