function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Sleumer, Hermann Otto', 4],
    ['Stevens, Peter Francis', 2],
    ['Tong, Yi Hua & Xia, Nian He', 2],
    ['Tong, Yi-Hua & Bai, Ying & Feng, Jian-Ming & Ya, Ji-Dong', 1],
    ['Veldkamp, Jan Frederik', 1],
    ['Yang, Bin & Wang, Ping-Yuan & Tong, Yi-Hua & Tan, Yun-Hong', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=11)',
    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);