function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Annals and magazine of natural history, 13', 1],
    ['Centralblatt für Bakteriologie, Parasitenkunde und Infektionskrankheiten', 1],
    ['Izvestiya Tikhookeanskoi Nauchno-Promyslovi Ostantsii', 1],
    ['Japanese Journal of Zoology', 1],
    ['Journal of Parasitology', 1],
    ['Journal of helminthology', 1],
    ['Journal of the Fisheries Research Board of Canada', 1],
    ['Keigaku Publishing Company', 1],
    ['Nauchnye Doklady Vysshei Shkoly Biologicheskie Nauki', 2],
    ['Parasite', 1],
    ['Parasitologia al Dia', 2],
    ['Research Bulletin of the Meguro Parasitological Museum', 1],
    ['Revista Chilena de Historia Natural', 1],
    ['Revista de Biologia Marina', 3],
    ['Zoologischer Anzeiger', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=23)',
    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);