function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Annals of the Lyceum of Natural History of New York', 1],
    ['Archiv für Naturgeschichte', 1],
    ['Check List', 2],
    ['Copeia', 1],
    ['Monatsberichte der Akademie der Wissenschaft zu Berlin', 1],
    ['Natuurkundige Verhandelingen van de Hollandsche Maatschappij der Wetenschappen te Haarlem, Series 2', 1],
    ['Neotropical Ichthyol.', 1],
    ['Neotropical Ichthyology', 1],
    ['Proceedings of the Academy of Natural Sciences of Philadelphia', 1],
    ['Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften, Mathematisch-Naturwissenschaften Classe', 2],
    ['The Zoological Journal', 1],
    ['Wolfgang Gerle', 1],
    ['ZooKeys', 1],
    ['Zoosystema', 1],
    ['Zootaxa', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=17)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 15, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);