function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Biologia Gallo-Hellenica', 1],
    ['Check List', 1],
    ['Eawag: Swiss Federal Institute of Aquatic Science and Technology', 3],
    ['Report of the United States Commissioner of Fish and Fisheries', 1],
    ['Rev. Idrobiol.', 1],
    ['Trudy Otdela Ichtiol. Russ. Obsc. Akklimat. Zhiv. Moskva.', 1],
    ['Turkish Journal of Zoology', 2],
    ['Vestnik Zoologii', 2],
    ['Zoosystematica rossica', 1],
    ['Zootaxa', 7]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);