function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Heller, Klaus-Gerhard & Hemp, Claudia & Massa, Bruno', 1],
    ['Koçak, Ahmet Ömer & Kemal, Muhabbet & Seven, Erdem', 1],
    ['Nagar, Rajendra & Swaminathan, R. & Mal, Jhabar', 3],
    ['Nagar, Rajendra & Swaminathan, Rajamani & Meena, Ashok Kumar', 4],
    ['Senthilkumar, Natchiappan & Divya, Govindaraj', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=10)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 5, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);