function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Garlitska, Lesya & Chertoprud, Elena S.', 2],
    ['Hafeezullah, M. & Siddiqi, Ather H.', 1],
    ['Kim, Jong Guk & Lee, Jimin & Huys, Rony', 3],
    ['Kim, Jong Guk & Yu, Ok Hwan & Lee, Jimin', 3],
    ['Vasconcelos, Danielle Menor & George, Kai Horst', 1],
    ['Willen, Elke', 1],
    ['Willen, Elke & Schulz, Maximilian', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=12)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);