function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Acta Biologica Universitatis Daugavpiliensis', 1],
    ['Acta Entomologica Musei Nationalis Pragae', 2],
    ['Annals of the Lyceum of Natural History of New York', 1],
    ['Baltic journal of coleopterology', 3],
    ['Bulletin de la Société Impériale des Naturalistes de Moscou', 2],
    ['Edman', 1],
    ['Fauna of New Zealand', 2],
    ['Insects of Guam I', 1],
    ['Japanese Journal of Entomology', 1],
    ['Linzer biologische Beiträge', 1],
    ['The Scientific Transactions of the Royal Dublin Society, Series 2', 1],
    ['ZooKeys', 5],
    ['Zootaxa', 30]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=51)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);