function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Christ. Gottl. Proft', 1],
    ['Insecta Mundi', 1],
    ['Kongl. Vetenskaps Academiens Nya Handlingar', 1],
    ['Laurentius Salvius', 6],
    ['Nouveau dictionnaire d\'histoire naturelle [ed. 2]', 4],
    ['Schulz-Wundermann', 2],
    ['ZooKeys', 10],
    ['Zootaxa', 15]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=40)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);