function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Acta Zoologica Sinica', 1],
    ['Annals of Tropical Medicine and Parasitology', 1],
    ['Applied Parasitology', 1],
    ['Canadian Journal of Zoology', 2],
    ['Izv Donsk Vet Inst Novogerkassk', 1],
    ['Journal of Parasitology', 2],
    ['Keigaku', 1],
    ['Parasite', 1],
    ['Parasitology International', 1],
    ['Research and Reviews in Parasitology', 1],
    ['Revista Brasileira de Biologia', 1],
    ['Revue de Zoologie et de Botanique Africaines', 7],
    ['Systematic Parasitology', 2],
    ['Zeitschrift für Parasitenkunde', 3],
    ['Zoodiversity', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=27)',
    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);