function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chamutiová, Tímea & Hamerlík, Ladislav & Bitušík, Peter', 2],
    ['Ekrem, Torbjørn & Elisabeth Stur', 1],
    ['Kobayashi, Tadashi & Endo, Kazuo', 1],
    ['Mendes, Humberto Fonseca & Pinho, Luiz Carlos', 2],
    ['Tasdemir, Ayse & Akyildiz, Gurcay Kivanc', 5],
    ['Yan, Chuncai & Jin, Zhaohui & Wang, Xinhua', 8]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=19)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);