function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Hugel, Sylvain', 1],
    ['Liu, Jing & Luo, Haiyu & Lu, Xiangyi & Bian, Xun', 1],
    ['Naskrecki, Piotr & Rentz, David C. F.', 5],
    ['Rentz, Dcf & Su, You Ning', 1],
    ['Swezey, O. H.', 1],
    ['Tan, Ming Kai & Ingrisch, Sigfrid & Robillard, Tony', 4],
    ['Tan, Ming Kai & Japir, Razy & Chung, Arthur Y. C.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=15)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);