function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Archiv der Insectengeschichte', 1],
    ['Augustin Bernardi Buchha ̈ ndler', 8],
    ['Der Naturforscher, Halle', 4],
    ['Der Verfasser', 2],
    ['Entomo Helvetica', 1],
    ['Ioannis Thomae Trattner', 1],
    ['L. Salvius', 2],
    ['Laurentii Salvii', 2],
    ['Laurentius Salvius', 39],
    ['Mich. Friedr. Bartsch', 1],
    ['Nic. Th. Gravius', 3],
    ['Officina Libraria Kortii', 6],
    ['Sammlung europäischer Schmetterlinge', 3],
    ['Siegfried Lebrecht Crusius', 1],
    ['Wolfgang Walthers', 7],
    ['Other (3)', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=84)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);