function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Grego, Jozef & Szekeres, Miklos', 1],
    ['Hwang, Chung-Chi', 2],
    ['Inkhavilay, Khamla & Sutcharit, Chirasak & Bantaowong, Ueangfa', 4],
    ['Man, Nem Sian & Lwin, Ngwe & Sutcharit, Chirasak & Panha, Somsak', 11],
    ['Nordsieck, Hartmut', 15]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=33)',
    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);