function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Acta Zootaxonomica Sinica', 1],
    ['Annales du Musée Royal du Congo Belge, Série 4, Zoologiques', 2],
    ['Arb. Univ. Bergen Mat. - Naturv.', 1],
    ['Biodiversity Data Journal', 3],
    ['Centralblatt für Bakteriologie, Parasitenkunde und Infektionskrankheiten', 1],
    ['Journal of Parasitology', 1],
    ['Proceedings of the Helminthological Society of Washington', 1],
    ['Quarterly journal of microscopical science, n. s.', 1],
    ['Transactions of the American Microscopical Society', 2],
    ['ZooKeys', 1],
    ['Zoopathologica', 1],
    ['Zootaxa', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=19)',
    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);