function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Biodiversity Data Journal', 16],
    ['Botanica Marina', 29],
    ['Cryptogamie, Mycologie', 30],
    ['Far Eastern Entomologist', 7],
    ['Japanese Journal of Systematic Entomology', 2],
    ['Journal of Natural History', 2],
    ['MycoKeys', 203],
    ['Phytochemistry', 4],
    ['Phytotaxa', 300],
    ['Records of the Australian Museum', 2],
    ['Reports of Science Research Voyage of H. M. S. Challenger. Zoology', 1],
    ['Systematic Parasitology', 1],
    ['ZooKeys', 1],
    ['Zoosystema', 7],
    ['Zootaxa', 10]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=615)',
    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);