function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chaari, Manel & Derbel, Hela & Neifar, Lassad', 1],
    ['Fantham, H. B.', 1],
    ['Price, E. W.', 1],
    ['Ramadan, M. M. & Morsy, Gazaa H. & Lashein, Gihan H. A.', 1],
    ['Toman, Gerd', 1],
    ['Yamaguti, S.', 2],
    ['Zhang, R. - s. & Qiu, Z. - z. & Li, Q. - k.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=8)',
    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);