function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ezhegodnik Zoologicheskogo Muzeya Ross. Akademii Nauk', 1],
    ['Trudy Zoologicheskogo Instituta Akademii Nauk SSSR. [Proc. Zool. Inst. Acad. Sci.]', 1],
    ['Vestnik Dal\'nevostochnogo Filiala Akademii Nauk SSSR [Bulletin of the Far Eastern Branch of the Academy of Sciences U. S. S. R.]', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=3)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 3, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);