function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Alipanah, Helen & Slamka, František', 1],
    ['Chen, Kai & Horak, Marianne & Du, Xicui & Zhang, Dandan', 4],
    ['Gumhalter, Danijela & Kučinić, Mladen & Šašić, Martina', 1],
    ['Liu, Ping & Qi, Mujie & Wang, Shuxia', 5],
    ['Poltavsky, Alexander N. & Kravchenko, Vasiliy D.', 2],
    ['Singh, Navneet & Ranjan, Rahul & Talukdar, Avishek', 6]
  ]);
  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);