function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Hollier, John & Bruckner, Harald & Heads, Sam W.', 1],
    ['Ma, Libin & Zhang, Ya-Lin', 6],
    ['Ma, Libin & Zhang, Yalin', 8],
    ['Nyobe, Philene Corinne Aude Um & Ngoute, Charly Oumarou', 2],
    ['Tan, Ming Kai & Abdul Wahab, Rodzay bin Haji', 1],
    ['Tan, Ming Kai & Japir, Razy & Chung, Arthur Y. C.', 1],
    ['Tan, Ming Kai & Kamaruddin, Khairul Nizam', 1],
    ['Wang, Ning & Huang, Huateng & Ma, Li-Bin', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=22)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);