function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Annals and Magazine of Natural History, Including Zoology, Botany and Geology, Being a Continuation of the \' Magazine of Botany ', 4],
    ['Bulletin de la Société Impériale des Naturalistes de Moscou', 1],
    ['Entomologist\'s monthly magazine', 1],
    ['Geodiversitas', 2],
    ['Insecta Mundi', 6],
    ['Japanese Journal of Systematic Entomology', 1],
    ['Magazin für Insektenkunde', 1],
    ['The Coleopterists Bulletin', 1],
    ['Transactions of the Entomological Society of London', 1],
    ['ZooKeys', 3],
    ['Zoological Systematics', 2],
    ['Zootaxa', 6]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=29)',
    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);